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Part 5 of 9 - Question 13 of 251.0 PointsAccepted char.docxherbertwilson5999
Part 5 of 9 -
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.
Compute the variance of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry.
Part 6 of 9 -
Question 14 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.
x
0
1
2
3
4
5
6
P (X=x)
0.55
0.15
0.10
0.10
0.04
0.03
0.03
Find P(1 < X < 5). Place your answer, rounded to two decimal places in the blank. For example, 0.56 would be a legitimate entry.
Question 15 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
In February 2002 the Argentine peso lost 70% of its value compared to the United States dollar. This devaluation drastically raised the price of imported products. According to a survey conducted by AC Nielsen in April 2002, 68% of the consumers in Argentina were buying fewer products than before the devaluation, 24% were buying the same number of products, and 8% were buying more products. Furthermore, in a trend toward purchasing less-expensive brands, 88% indicated that they had changed the brands they purchased. Suppose the following complete set of results were reported. Use the following data to answer this question.
Number of Products Purchased
Brands Purchased
Fewer
Same
More
Total
Same
10
14
24
48
Changed
262
82
8
352
Total
272
96
32
400
What is the probability that a consumer selected at random purchased fewer products than before? Place.
Question 13 of 251.0 PointsAccepted characters numbers, decimal p.pdfalamshoes001
Question 13 of 251.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), \"E\" or \"e\" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where \"a\" and \"b\" need to have explicitly
stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A statistics professor has just given a final examination in his statistical inference course. He is
particularly interested in learning how his class of 40 students performed on this exam. The
scores are shown below.
77 81 74 77 79 73 80 85 86 73
83 84 81 73 75 91 76 77 95 76
90 85 92 84 81 64 75 90 78 7882 78 86 86
82 70 76 78 72 93
What is the mean score on this exam? Place your answer, rounded to two decimal places in the
blank. For example, 65.78 would be a legitimate entry.
Question 14 of 251.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), \"E\" or \"e\" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where \"a\" and \"b\" need to have explicitly
stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
In February 2002 the Argentine peso lost 70% of its value compared to the United States dollar.
This devaluation drastically raised the price of imported products. According to a survey
conducted by AC Nielsen in April 2002, 68% of the consumers in Argentina were buying fewer
products than before the devaluation, 24% were buying the same number of products, and 8%
were buying more products. Furthermore, in a trend toward purchasing less-expensive brands,
88% indicated that they had changed the brands they purchased. Suppose the following complete
set of results were reported. Use the following data to answer this question.
Number of Products Purchased
Brands Purchased
Fewer
Same
More
Total
Same
10
14
24
48
Changed
262
82
8
352
Total
272
96
32
400
What is the probability that a consumer selected at random purchased fewer products than before
and changed brands? Place your answer, rounded to 4 decimal places, in the blank.
Question 15 of 251.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), \"E\" or \"e\" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where \"a\" and \"b\" need to have explicitly
stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A school determines that the number of children X in the families who attend the school follows
the distri.
Sheet1QUESTIONS NumberANSWERS1234567891011121314151617181920
Sheet2
Sheet3
Question 1 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption
is mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 11.2 mpg. If 30
such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater
than 27?
Answer: Round your answer to 4 decimal places as necessary. For example, 0.1357 would
be a legitimate entry.
Question 2 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A marketing research consultant hired by Coca-Cola is interested in determining the proportion of
customers who favor Coke over other soft drinks. A random sample of 400 consumers was selected from
the market under investigation and showed that 53% favored Coca-Cola over other brands.
Compute a 95% confidence interval for the true proportion of people who favor Coke. Place your
LOWER limit, rounded to 3 decimal places, in the first blank . For example, .345 would be a
legitimate entry. Place your UPPER limit in the second blank . For example, .456 would be a
legitimate entry.
Question 3 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 9 production managers with over 15 years of experience has an average salary of $71,000
and a sample standard deviation of $18,000.
Assuming that s = 18,000 is a reasonable estimate for what sample size would be needed to ensure
that we could estimate the true mean salary of all production managers with more than 15 years
experience within $4200 if we wi.
Part 1 of 9 - Question 1 of 251.0 PointsA sample of 20 obs.docxherbertwilson5999
Part 1 of 9 -
Question 1 of 25
1.0 Points
A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is:
A.400
B.320
C.304
D.288
Part 2 of 9 -
Question 2 of 25
1.0 Points
What type of probability uses sample spaces to determine the numerical probability that an event will occur?
A.classical probability
B.conditional probability
C.empirical probability
D.subjective probability
Question 3 of 25
1.0 Points
If A and B are any two events with P(A) = .8 and P(B|A) = .4, then the joint probability of A and B is
A.0.32
B.0.80
C.0.40
D.1.20
Part 3 of 9 -
Question 4 of 25
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.20
2
0.35
3
0.10
4
0.25
5
0.10
A.1.83
B.1.31
C.1.25
D.1.71
Question 5 of 25
1.0 Points
Which term is NOT synonymous with the expected value of a discrete probability distribution?
A.variance
B.mean
C.theoretical average
D.μ
Question 6 of 25
1.0 Points
If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.
A.0.19
B.0.17
C.0.08
D.0.23
Part 4 of 9 -
Question 7 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:
A.binomial distribution
B.Poisson distribution
C.exponential distribution
D.normal distribution
Question 8 of 25
1.0 Points
The standard deviation of a probability distribution must be:
A.a nonnegative number
B.a negative number
C.a number between 0 and 1
D.less than the value of the mean
Question 9 of 25
1.0 Points
The mean of a probability distribution can be:
A.a positive number
B.a negative number
C.zero
D.all of the above
Question 10 of 25
1.0 Points
The standard deviation of is usually called the
A.standard error of the population
B.randomized standard error
C.standard error of the mean
D.standard error of the sample
Question 11 of 25
1.0 Points
The theorem that states that the sampling distribution of the sample mean is approximately normal when the sample size n is reasonably large is known as the:
A.point estimate theorem
B.central limit theorem
C.simple random sample theorem
D.central tendency theorem
Question 12 of 25
1.0 Points
The standard normal distribution has a mean of ___ and standard deviation of ___, respectively.
A.1 and 1
B.0 and 0
C.1 and 0
D.0 and 1
Part 5 of 9 -
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A statistics profess.
Part 1 of 9 -Question 1 of 251.0 PointsWhich of the followin.docxherbertwilson5999
Part 1 of 9 -
Question 1 of 25
1.0 Points
Which of the following statistics is not a measure of central location?
A.Mode
B.Mean
C.Median
D.Interquartile range
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Part 2 of 9 -
Question 2 of 25
1.0 Points
If A and B are any two events with P(A) = .8 and then is:
A.0.875
B.0.14
C..24
D.0.56
Reset Selection
Question 3 of 25
1.0 Points
If one tosses a coin enough times, the proportion of "heads" will approach 0.5. This is an example of:
A.the Law of Large Numbers
B.subjective probabilities
C.the Central Limit Theorem
D.the Empirical Rule
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Part 3 of 9 -
Question 4 of 25
1.0 Points
A discrete probability distribution:
A.can be estimated from long-run proportions
B.is a tool that can be used to incorporate uncertainty into models
C.is the distribution of multiple random variables
D.lists all of the possible values of the random variable and their corresponding probabilities
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Question 5 of 25
1.0 Points
A drug is reported to benefit 40% of the patients who take it. If 6 patients take the drug, what is the probability that 4 or more patients will benefit?
A.0.138
B.0.862
C.0.667
D.0.179
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Question 6 of 25
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.20
2
0.35
3
0.10
4
0.25
5
0.10
A.1.83
B.1.31
C.1.25
D.1.71
Reset Selection
Part 4 of 9 -
Question 7 of 25
1.0 Points
Find the probability, P(Z < 0.17), using the standard normal distribution.
A..8300
B..4325
C..5675
D..0675
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Question 8 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:
A.normal distribution
B.binomial distribution
C.exponential distribution
D.Poisson distribution
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Question 9 of 25
1.0 Points
Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is
A.0.9332
B.0.7745
C.0.8413
D.0.0919
Reset Selection
Question 10 of 25
1.0 Points
The standard normal distribution has a mean of ___ and standard deviation of ___, respectively.
A.0 and 0
B.1 and 0
C.1 and 1
D.0 and 1
Reset Selection
Question 11 of 25
1.0 Points
One reason for standardizing random variables is to measure variables with:
A.dissimilar means and similar standard deviations in like terms
B.similar means and standard deviations on two scales
C.different means and standard deviations on a single scale
D.different means and standard deviations on a non-standard scale
Reset Selection
Question 12 of 25
1.0 Points
The mean of a probability distribution is a:
A.measure of relative likelihood
B.measure of central location
C.measure of variability of the distribution
D.measure of skewness of the distribution
Reset Selection
Part 5 of 9 -
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousan.
Question 1 of 201.0 PointsAccepted characters numbers, decima.docxIRESH3
Question 1 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 9 production managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000.
Assuming that the salaries of production managers with over 15 years experience are normally distributed, you can be 95% confident that the mean salary for all production managers with at least 15 years of experience is between what two numbers.
Place your LOWER limit, rounded to a whole number, in the first blank. Do not use a dollar sign, a comma, or any other stray mark. For example, 54321 would be a legitimate entry. . Place your UPPER limit, rounded to a whole number, in the second blank. Do not use a dollar sign, a comma, or any other stray mark. For example, 65432 would be a legitimate entry. Question 2 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 25.9 mpg and a standard deviation of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?
Answer: Round your answer to 4 decimal places as necessary. For example, 0.1357 would be a legitimate entry. Question 3 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What is the 95% confidence interval estimate for the average number of years served by all Supreme Court justices? Place your limits, rounded to 1 de ...
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Part 1 of 9 -
Question 1 of 25
1.0 Points
Since the population is always larger than the sample, the population mean:
A.is always larger than or equal to the sample mean
B.can be smaller than, or larger than, or equal to the sample mean
C.is always smaller than or equal to the sample mean
D.is always strictly less than the sample mean
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Part 2 of 9 -
Question 2 of 25
1.0 Points
If two events are mutually exclusive, what is the probability that both occur at the same time?
A.0.00
B.Cannot be determined from the information given.
C.0.50
D.1.00
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Question 3 of 25
1.0 Points
The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected at random, what is the probability that he or she is a factory worker?
A.2/5
B.5/8
C.1/4
D.1/8
Reset Selection
Part 3 of 9 -
Question 4 of 25
1.0 Points
The binomial probability distribution is used with
A.a continuous random variable
B.a discrete random variable
C.either a discrete or a continuous random variable, depending on the sample size
D.either a discrete or a continuous random variable, depending on the variance
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Question 5 of 25
1.0 Points
We assume that the outcomes of successive trials in a binomial experiment are:
A.identical from trial to trial
B.probabilistically dependent
C.random numbers between 0 and 1
D.probabilistically independent
Reset Selection
Question 6 of 25
1.0 Points
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
What is the probability that fewer than 25 batteries will last at least 8 hours?
A.0.0024
B.0.0009
C.0.9991
D.0.8967
Reset Selection
Part 4 of 9 -
Question 7 of 25
1.0 Points
Find the probability, P(.
Question 1 of 201.0 PointsThe result of tossing a coin once wi.docxIRESH3
Question 1 of 20
1.0 Points
The result of tossing a coin once will be either head or tail. Let A and B be the events of observing head and tail, respectively. The events A and B are:
A.mutually exclusive
B.independent
C.conditional
D.unilateral
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Question 2 of 20
1.0 Points
The formal way to revise probabilities based on new information is to use:
A.unilateral probabilities
B.common sense probabilities
C.conditional probabilities
D.complementary probabilities
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Question 3 of 20
1.0 Points
If 25 tickets are sold and 2 prizes are to be awarded, find the probability that one person will win both prizes if that person buys exactly 2 tickets.
A.1/300
B.1/700
C.1/600
D.1/2300
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Question 4 of 20
1.0 Points
If a die is rolled one time, find the probability of getting a number greater than 2.
A.2
B.-1
C.5/6
D.4/6
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Question 5 of 20
1.0 Points
If two events are mutually exclusive, what is the probability that both occur at the same time?
A.0.00
B.1.00
C.0.50
D.Cannot be determined from the information given.
Reset Selection
Part 2 of 6 -
Question 6 of 20
1.0 Points
We assume that the outcomes of successive trials in a binomial experiment are:
A.identical from trial to trial
B.random numbers between 0 and 1
C.probabilistically independent
D.probabilistically dependent
Reset Selection
Question 7 of 20
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.10
2
0.20
3
0.35
4
0.30
5
0.05
A.1.1
B.1.21
C.1.05
D.1.02
Reset Selection
Question 8 of 20
1.0 Points
A die is rolled 360 times. Find the standard deviation for the number of 3s that will be rolled.
A.60
B.50
C.7.1
D.5.9
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Question 9 of 20
1.0 Points
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
What is the probability that between 25 and 30 batteries (inclusive) will last at least 8 hours?
A.0.0839
B.0.7792
C.0.1186
D.0.9169
Reset Selection
Question 10 of 20
1.0 Points
If a gambler rolls two dice and gets a sum of 10, he wins $10, and if he gets a sum of three, he wins $20. The cost to play the game is $5. What is the expectation of this game?
A.$3.06
B.-$2.78
C.-$3.06
D.$2.78
Reset Selection
Part 3 of 6 -
Question 11 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The annual returns, i ...
Part 1 of 9 -Question 1 of 251.0 PointsSuppose that a hist.docxherbertwilson5999
Part 1 of 9 -
Question 1 of 25
1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately, what percent of the observations are within three standard deviations of the mean?
A.95%
B.68%
C.50%
D.99.7%
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Part 2 of 9 -
Question 2 of 25
1.0 Points
If the probability that it will rain tomorrow is 0.38, then the probability that it will not rain tomorrow is:
A.0.38
B.-0.38
C.0.62
D.1.38
Reset Selection
Question 3 of 25
1.0 Points
What is the probability of drawing two queens in a row from a standard deck of cards without replacement?
A.0.0385
B.0.0059
C.0.0045
D.0.0015
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Part 3 of 9 -
Question 4 of 25
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.30
2
0.15
3
0.05
4
0.25
5
0.25
A.1.73
B.1.61
C.2.60
D.1.27
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Question 5 of 25
1.0 Points
According to an Internet posting, 80% of adults enjoy drinking beer. A group of 7 adults is chosen randomly. The probability that no more than 3 of them enjoy drinking beer is:
A.0.029
B.0.033
C.0.267
D.0.429
Reset Selection
Question 6 of 25
1.0 Points
The probability distribution associated with the number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below.
x P(X)
0 0.15
1 0.20
2 0.30
3 0.10
4 0.20
5 0.05
0
Find the standard deviation for the probability distribution above.
A.1.46
B.2.25
C.1.89
D.1.18
Reset Selection
Part 4 of 9 -
Question 7 of 25
1.0 Points
One reason for standardizing random variables is to measure variables with:
A.different means and standard deviations on a single scale
B.similar means and standard deviations on two scales
C.dissimilar means and similar standard deviations in like terms
D.different means and standard deviations on a non-standard scale
Reset Selection
Question 8 of 25
1.0 Points
The average height of flowering cherry trees in a nursery is 11 feet. If the heights are normally distributed with a standard deviation of 1.6, find the probability that a randomly selected cherry tree in this nursery is less than 13 feet tall.
A. 0.67
B.0.89
C.0.95
D.0.11
Reset Selection
Question 9 of 25
1.0 Points
The standard deviation of a probability distribution must be:
A.a negative number
B.a nonnegative number
C.a number between 0 and 1
D.less than the value of the mean
Reset Selection
Question 10 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:
A.binomial distribution
B.normal distribution
C.Poisson distribution
D.exponential distribution
Reset Selection
Question 11 of 25
1.0 Points
Given that Z is a standard normal variable, the value z for which P(Z < z) = 0.2580 is
A.0.242
B.0.758
C.-0.70
D.-0.65
Reset Selection
Question 12 of 25
1.0 Points
Given that the random variable X is normally distributed with a mean of 8.
Question 1 of 201.0 PointsAccepted characters numbers.docxteofilapeerless
Question 1 of 20
1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 40 country CD recordings of Willie Nelson has been examined. The average playing time of these recordings is 51.3 minutes, and the standard deviation is s = 5.8 minutes.
Using an appropriate t-multiplier, construct a 95% confidence interval for the mean playing time of all Willie Nelson recordings.
Place your LOWER limit, in minutes, rounded to 2 decimal places, in the first blank. For example, 56.78 would be a legitimate entry. [removed] .
Place your UPPER limit, in minutes, rounded to 2 decimal places, in the second blank. For example, 67.89 would be a legitimate entry. [removed]
Question 2 of 20
1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What is the 95% confidence interval estimate for the average number of years served by all Supreme Court justices? Place your limits,
rounded to 1 decimal place
, in the blanks. Place you lower limit in the first blank. [removed] Place your upper limit in the second blank. [removed] When entering your answer do not use any labels or symbols. Simply provide the numerical value. For example, 12.3 would be a legitimate entry.
Question 3 of 20
1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. A random sample of 12 employees reveals the following family dental expenses (in dollars): 115, 370, 250, .
Find out how you can simplify your business expenses & petty cash management.
This quick guide shows the team how to; submit a budget request, update transactions & return unspent budget
aio* provide an expense management solution for businesses by connecting prepaid business MasterCards with a management app.
This allows managers to easily allocate, manage and approve budgets, track spend in real time and have all the information ready for book keepers without the hassle of dealing with expense reports, reclaims processes or reimbursement.
For the employees it means never being out of pocket and not having to collect and submit physical receipts, seek reimbursements or perform the administration associated with work expenses
Part 5 of 9 - Question 13 of 251.0 PointsAccepted char.docxherbertwilson5999
Part 5 of 9 -
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.
Compute the variance of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry.
Part 6 of 9 -
Question 14 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.
x
0
1
2
3
4
5
6
P (X=x)
0.55
0.15
0.10
0.10
0.04
0.03
0.03
Find P(1 < X < 5). Place your answer, rounded to two decimal places in the blank. For example, 0.56 would be a legitimate entry.
Question 15 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
In February 2002 the Argentine peso lost 70% of its value compared to the United States dollar. This devaluation drastically raised the price of imported products. According to a survey conducted by AC Nielsen in April 2002, 68% of the consumers in Argentina were buying fewer products than before the devaluation, 24% were buying the same number of products, and 8% were buying more products. Furthermore, in a trend toward purchasing less-expensive brands, 88% indicated that they had changed the brands they purchased. Suppose the following complete set of results were reported. Use the following data to answer this question.
Number of Products Purchased
Brands Purchased
Fewer
Same
More
Total
Same
10
14
24
48
Changed
262
82
8
352
Total
272
96
32
400
What is the probability that a consumer selected at random purchased fewer products than before? Place.
Question 13 of 251.0 PointsAccepted characters numbers, decimal p.pdfalamshoes001
Question 13 of 251.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), \"E\" or \"e\" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where \"a\" and \"b\" need to have explicitly
stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A statistics professor has just given a final examination in his statistical inference course. He is
particularly interested in learning how his class of 40 students performed on this exam. The
scores are shown below.
77 81 74 77 79 73 80 85 86 73
83 84 81 73 75 91 76 77 95 76
90 85 92 84 81 64 75 90 78 7882 78 86 86
82 70 76 78 72 93
What is the mean score on this exam? Place your answer, rounded to two decimal places in the
blank. For example, 65.78 would be a legitimate entry.
Question 14 of 251.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), \"E\" or \"e\" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where \"a\" and \"b\" need to have explicitly
stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
In February 2002 the Argentine peso lost 70% of its value compared to the United States dollar.
This devaluation drastically raised the price of imported products. According to a survey
conducted by AC Nielsen in April 2002, 68% of the consumers in Argentina were buying fewer
products than before the devaluation, 24% were buying the same number of products, and 8%
were buying more products. Furthermore, in a trend toward purchasing less-expensive brands,
88% indicated that they had changed the brands they purchased. Suppose the following complete
set of results were reported. Use the following data to answer this question.
Number of Products Purchased
Brands Purchased
Fewer
Same
More
Total
Same
10
14
24
48
Changed
262
82
8
352
Total
272
96
32
400
What is the probability that a consumer selected at random purchased fewer products than before
and changed brands? Place your answer, rounded to 4 decimal places, in the blank.
Question 15 of 251.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), \"E\" or \"e\" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where \"a\" and \"b\" need to have explicitly
stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A school determines that the number of children X in the families who attend the school follows
the distri.
Sheet1QUESTIONS NumberANSWERS1234567891011121314151617181920
Sheet2
Sheet3
Question 1 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption
is mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 11.2 mpg. If 30
such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater
than 27?
Answer: Round your answer to 4 decimal places as necessary. For example, 0.1357 would
be a legitimate entry.
Question 2 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A marketing research consultant hired by Coca-Cola is interested in determining the proportion of
customers who favor Coke over other soft drinks. A random sample of 400 consumers was selected from
the market under investigation and showed that 53% favored Coca-Cola over other brands.
Compute a 95% confidence interval for the true proportion of people who favor Coke. Place your
LOWER limit, rounded to 3 decimal places, in the first blank . For example, .345 would be a
legitimate entry. Place your UPPER limit in the second blank . For example, .456 would be a
legitimate entry.
Question 3 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 9 production managers with over 15 years of experience has an average salary of $71,000
and a sample standard deviation of $18,000.
Assuming that s = 18,000 is a reasonable estimate for what sample size would be needed to ensure
that we could estimate the true mean salary of all production managers with more than 15 years
experience within $4200 if we wi.
Part 1 of 9 - Question 1 of 251.0 PointsA sample of 20 obs.docxherbertwilson5999
Part 1 of 9 -
Question 1 of 25
1.0 Points
A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is:
A.400
B.320
C.304
D.288
Part 2 of 9 -
Question 2 of 25
1.0 Points
What type of probability uses sample spaces to determine the numerical probability that an event will occur?
A.classical probability
B.conditional probability
C.empirical probability
D.subjective probability
Question 3 of 25
1.0 Points
If A and B are any two events with P(A) = .8 and P(B|A) = .4, then the joint probability of A and B is
A.0.32
B.0.80
C.0.40
D.1.20
Part 3 of 9 -
Question 4 of 25
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.20
2
0.35
3
0.10
4
0.25
5
0.10
A.1.83
B.1.31
C.1.25
D.1.71
Question 5 of 25
1.0 Points
Which term is NOT synonymous with the expected value of a discrete probability distribution?
A.variance
B.mean
C.theoretical average
D.μ
Question 6 of 25
1.0 Points
If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.
A.0.19
B.0.17
C.0.08
D.0.23
Part 4 of 9 -
Question 7 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:
A.binomial distribution
B.Poisson distribution
C.exponential distribution
D.normal distribution
Question 8 of 25
1.0 Points
The standard deviation of a probability distribution must be:
A.a nonnegative number
B.a negative number
C.a number between 0 and 1
D.less than the value of the mean
Question 9 of 25
1.0 Points
The mean of a probability distribution can be:
A.a positive number
B.a negative number
C.zero
D.all of the above
Question 10 of 25
1.0 Points
The standard deviation of is usually called the
A.standard error of the population
B.randomized standard error
C.standard error of the mean
D.standard error of the sample
Question 11 of 25
1.0 Points
The theorem that states that the sampling distribution of the sample mean is approximately normal when the sample size n is reasonably large is known as the:
A.point estimate theorem
B.central limit theorem
C.simple random sample theorem
D.central tendency theorem
Question 12 of 25
1.0 Points
The standard normal distribution has a mean of ___ and standard deviation of ___, respectively.
A.1 and 1
B.0 and 0
C.1 and 0
D.0 and 1
Part 5 of 9 -
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A statistics profess.
Part 1 of 9 -Question 1 of 251.0 PointsWhich of the followin.docxherbertwilson5999
Part 1 of 9 -
Question 1 of 25
1.0 Points
Which of the following statistics is not a measure of central location?
A.Mode
B.Mean
C.Median
D.Interquartile range
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Part 2 of 9 -
Question 2 of 25
1.0 Points
If A and B are any two events with P(A) = .8 and then is:
A.0.875
B.0.14
C..24
D.0.56
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Question 3 of 25
1.0 Points
If one tosses a coin enough times, the proportion of "heads" will approach 0.5. This is an example of:
A.the Law of Large Numbers
B.subjective probabilities
C.the Central Limit Theorem
D.the Empirical Rule
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Part 3 of 9 -
Question 4 of 25
1.0 Points
A discrete probability distribution:
A.can be estimated from long-run proportions
B.is a tool that can be used to incorporate uncertainty into models
C.is the distribution of multiple random variables
D.lists all of the possible values of the random variable and their corresponding probabilities
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Question 5 of 25
1.0 Points
A drug is reported to benefit 40% of the patients who take it. If 6 patients take the drug, what is the probability that 4 or more patients will benefit?
A.0.138
B.0.862
C.0.667
D.0.179
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Question 6 of 25
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.20
2
0.35
3
0.10
4
0.25
5
0.10
A.1.83
B.1.31
C.1.25
D.1.71
Reset Selection
Part 4 of 9 -
Question 7 of 25
1.0 Points
Find the probability, P(Z < 0.17), using the standard normal distribution.
A..8300
B..4325
C..5675
D..0675
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Question 8 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:
A.normal distribution
B.binomial distribution
C.exponential distribution
D.Poisson distribution
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Question 9 of 25
1.0 Points
Given that Z is a standard normal random variable, P(-1.0 < Z < 1.5) is
A.0.9332
B.0.7745
C.0.8413
D.0.0919
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Question 10 of 25
1.0 Points
The standard normal distribution has a mean of ___ and standard deviation of ___, respectively.
A.0 and 0
B.1 and 0
C.1 and 1
D.0 and 1
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Question 11 of 25
1.0 Points
One reason for standardizing random variables is to measure variables with:
A.dissimilar means and similar standard deviations in like terms
B.similar means and standard deviations on two scales
C.different means and standard deviations on a single scale
D.different means and standard deviations on a non-standard scale
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Question 12 of 25
1.0 Points
The mean of a probability distribution is a:
A.measure of relative likelihood
B.measure of central location
C.measure of variability of the distribution
D.measure of skewness of the distribution
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Part 5 of 9 -
Question 13 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousan.
Question 1 of 201.0 PointsAccepted characters numbers, decima.docxIRESH3
Question 1 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 9 production managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000.
Assuming that the salaries of production managers with over 15 years experience are normally distributed, you can be 95% confident that the mean salary for all production managers with at least 15 years of experience is between what two numbers.
Place your LOWER limit, rounded to a whole number, in the first blank. Do not use a dollar sign, a comma, or any other stray mark. For example, 54321 would be a legitimate entry. . Place your UPPER limit, rounded to a whole number, in the second blank. Do not use a dollar sign, a comma, or any other stray mark. For example, 65432 would be a legitimate entry. Question 2 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 25.9 mpg and a standard deviation of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?
Answer: Round your answer to 4 decimal places as necessary. For example, 0.1357 would be a legitimate entry. Question 3 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What is the 95% confidence interval estimate for the average number of years served by all Supreme Court justices? Place your limits, rounded to 1 de ...
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Part 1 of 9 -
Question 1 of 25
1.0 Points
Since the population is always larger than the sample, the population mean:
A.is always larger than or equal to the sample mean
B.can be smaller than, or larger than, or equal to the sample mean
C.is always smaller than or equal to the sample mean
D.is always strictly less than the sample mean
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Part 2 of 9 -
Question 2 of 25
1.0 Points
If two events are mutually exclusive, what is the probability that both occur at the same time?
A.0.00
B.Cannot be determined from the information given.
C.0.50
D.1.00
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Question 3 of 25
1.0 Points
The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected at random, what is the probability that he or she is a factory worker?
A.2/5
B.5/8
C.1/4
D.1/8
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Part 3 of 9 -
Question 4 of 25
1.0 Points
The binomial probability distribution is used with
A.a continuous random variable
B.a discrete random variable
C.either a discrete or a continuous random variable, depending on the sample size
D.either a discrete or a continuous random variable, depending on the variance
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Question 5 of 25
1.0 Points
We assume that the outcomes of successive trials in a binomial experiment are:
A.identical from trial to trial
B.probabilistically dependent
C.random numbers between 0 and 1
D.probabilistically independent
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Question 6 of 25
1.0 Points
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
What is the probability that fewer than 25 batteries will last at least 8 hours?
A.0.0024
B.0.0009
C.0.9991
D.0.8967
Reset Selection
Part 4 of 9 -
Question 7 of 25
1.0 Points
Find the probability, P(.
Question 1 of 201.0 PointsThe result of tossing a coin once wi.docxIRESH3
Question 1 of 20
1.0 Points
The result of tossing a coin once will be either head or tail. Let A and B be the events of observing head and tail, respectively. The events A and B are:
A.mutually exclusive
B.independent
C.conditional
D.unilateral
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Question 2 of 20
1.0 Points
The formal way to revise probabilities based on new information is to use:
A.unilateral probabilities
B.common sense probabilities
C.conditional probabilities
D.complementary probabilities
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Question 3 of 20
1.0 Points
If 25 tickets are sold and 2 prizes are to be awarded, find the probability that one person will win both prizes if that person buys exactly 2 tickets.
A.1/300
B.1/700
C.1/600
D.1/2300
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Question 4 of 20
1.0 Points
If a die is rolled one time, find the probability of getting a number greater than 2.
A.2
B.-1
C.5/6
D.4/6
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Question 5 of 20
1.0 Points
If two events are mutually exclusive, what is the probability that both occur at the same time?
A.0.00
B.1.00
C.0.50
D.Cannot be determined from the information given.
Reset Selection
Part 2 of 6 -
Question 6 of 20
1.0 Points
We assume that the outcomes of successive trials in a binomial experiment are:
A.identical from trial to trial
B.random numbers between 0 and 1
C.probabilistically independent
D.probabilistically dependent
Reset Selection
Question 7 of 20
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.10
2
0.20
3
0.35
4
0.30
5
0.05
A.1.1
B.1.21
C.1.05
D.1.02
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Question 8 of 20
1.0 Points
A die is rolled 360 times. Find the standard deviation for the number of 3s that will be rolled.
A.60
B.50
C.7.1
D.5.9
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Question 9 of 20
1.0 Points
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
What is the probability that between 25 and 30 batteries (inclusive) will last at least 8 hours?
A.0.0839
B.0.7792
C.0.1186
D.0.9169
Reset Selection
Question 10 of 20
1.0 Points
If a gambler rolls two dice and gets a sum of 10, he wins $10, and if he gets a sum of three, he wins $20. The cost to play the game is $5. What is the expectation of this game?
A.$3.06
B.-$2.78
C.-$3.06
D.$2.78
Reset Selection
Part 3 of 6 -
Question 11 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The annual returns, i ...
Part 1 of 9 -Question 1 of 251.0 PointsSuppose that a hist.docxherbertwilson5999
Part 1 of 9 -
Question 1 of 25
1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately, what percent of the observations are within three standard deviations of the mean?
A.95%
B.68%
C.50%
D.99.7%
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Part 2 of 9 -
Question 2 of 25
1.0 Points
If the probability that it will rain tomorrow is 0.38, then the probability that it will not rain tomorrow is:
A.0.38
B.-0.38
C.0.62
D.1.38
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Question 3 of 25
1.0 Points
What is the probability of drawing two queens in a row from a standard deck of cards without replacement?
A.0.0385
B.0.0059
C.0.0045
D.0.0015
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Part 3 of 9 -
Question 4 of 25
1.0 Points
Find the variance of the following probability distribution.
X
P(X)
1
0.30
2
0.15
3
0.05
4
0.25
5
0.25
A.1.73
B.1.61
C.2.60
D.1.27
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Question 5 of 25
1.0 Points
According to an Internet posting, 80% of adults enjoy drinking beer. A group of 7 adults is chosen randomly. The probability that no more than 3 of them enjoy drinking beer is:
A.0.029
B.0.033
C.0.267
D.0.429
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Question 6 of 25
1.0 Points
The probability distribution associated with the number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below.
x P(X)
0 0.15
1 0.20
2 0.30
3 0.10
4 0.20
5 0.05
0
Find the standard deviation for the probability distribution above.
A.1.46
B.2.25
C.1.89
D.1.18
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Part 4 of 9 -
Question 7 of 25
1.0 Points
One reason for standardizing random variables is to measure variables with:
A.different means and standard deviations on a single scale
B.similar means and standard deviations on two scales
C.dissimilar means and similar standard deviations in like terms
D.different means and standard deviations on a non-standard scale
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Question 8 of 25
1.0 Points
The average height of flowering cherry trees in a nursery is 11 feet. If the heights are normally distributed with a standard deviation of 1.6, find the probability that a randomly selected cherry tree in this nursery is less than 13 feet tall.
A. 0.67
B.0.89
C.0.95
D.0.11
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Question 9 of 25
1.0 Points
The standard deviation of a probability distribution must be:
A.a negative number
B.a nonnegative number
C.a number between 0 and 1
D.less than the value of the mean
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Question 10 of 25
1.0 Points
The continuous distribution characterized by a symmetric, bell-shaped curve is the:
A.binomial distribution
B.normal distribution
C.Poisson distribution
D.exponential distribution
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Question 11 of 25
1.0 Points
Given that Z is a standard normal variable, the value z for which P(Z < z) = 0.2580 is
A.0.242
B.0.758
C.-0.70
D.-0.65
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Question 12 of 25
1.0 Points
Given that the random variable X is normally distributed with a mean of 8.
Question 1 of 201.0 PointsAccepted characters numbers.docxteofilapeerless
Question 1 of 20
1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 40 country CD recordings of Willie Nelson has been examined. The average playing time of these recordings is 51.3 minutes, and the standard deviation is s = 5.8 minutes.
Using an appropriate t-multiplier, construct a 95% confidence interval for the mean playing time of all Willie Nelson recordings.
Place your LOWER limit, in minutes, rounded to 2 decimal places, in the first blank. For example, 56.78 would be a legitimate entry. [removed] .
Place your UPPER limit, in minutes, rounded to 2 decimal places, in the second blank. For example, 67.89 would be a legitimate entry. [removed]
Question 2 of 20
1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What is the 95% confidence interval estimate for the average number of years served by all Supreme Court justices? Place your limits,
rounded to 1 decimal place
, in the blanks. Place you lower limit in the first blank. [removed] Place your upper limit in the second blank. [removed] When entering your answer do not use any labels or symbols. Simply provide the numerical value. For example, 12.3 would be a legitimate entry.
Question 3 of 20
1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. A random sample of 12 employees reveals the following family dental expenses (in dollars): 115, 370, 250, .
Question 1 of 20 1.0 Points If a die is rolled one time, fin.docxIRESH3
Question 1 of 20
1.0 Points
If a die is rolled one time, find the probability of getting a number greater than 2.
A.2
B.-1
C.5/6
D.4/6
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Question 2 of 20
1.0 Points
The result of tossing a coin once will be either head or tail. Let A and B be the events of observing head and tail, respectively. The events A and B are:
A.mutually exclusive
B.independent
C.conditional
D.unilateral
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Question 3 of 20
1.0 Points
What is the probability of drawing two queens in a row from a standard deck of cards without replacement?
A.0.0059
B.0.0385
C.0.0015
D.0.0045
Reset Selection
Question 4 of 20
1.0 Points
If the probability that it will rain tomorrow is 0.38, then the probability that it will not rain tomorrow is:
A.0.38
B.-0.38
C.0.62
D.1.38
Reset Selection
Question 5 of 20
1.0 Points
If A and B are mutually exclusive events with P(A) = 0.70, then P(B):
A.cannot be larger than 0.30
B.can be any value between 0 and 0.70
C.cannot be determined with the information given
D.can be any value between 0 and 1
Reset Selection
Part 2 of 6 -
Question 6 of 20
1.0 Points
In one town 33% of the households have a vehicle with all-wheel drive. If 4 households are selected at random, what is the probability that all 4 have vehicles with all-wheel drive?
A.0.0119
B.0.33
C.0.0825
D.0.4662
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Question 7 of 20
1.0 Points
A pet supplier has a stock of parakeets of which 10% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?
A.0.081
B.0.243
C.0.027
D.0.003
Reset Selection
Question 8 of 20
1.0 Points
The probability distribution associated with the number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below.
x
P(x)
0
0.15
1
0.20
2
0.30
3
0.10
4
0.20
5
0.05
Find the standard deviation for the probability distribution above.
A.1.46
B.2.25
C.1.89
D.1.18
Reset Selection
Question 9 of 20
1.0 Points
Which of following statements are true regarding the probability distribution of a random variable X?
A.The probabilities must be nonnegative
B.The probabilities must sum to 1
C.The random variable must be continuous
D.Both (a) and (b)
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Question 10 of 20
1.0 Points
If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.
A.0.19
B.0.17
C.0.08
D.0.23
Reset Selection
Part 3 of 6 -
Question 11 of 20
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point mar ...
Question 1Two teams of workers assemble automobile e.docxIRESH3
Question 1
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. A random sample of 145 assemblies from team 1 shows 15 unacceptable assemblies. A similar random sample of 125 assemblies from team 2 shows 8 unacceptable assemblies.
Is there sufficient evidence to conclude, at the 10% significance level, that the two teams differ with respect to their proportions of unacceptable assemblies?
A.No, since the p-value is less than 0.10
B.No, since the test value exceeds the critical value
C.No, since the test value does not exceed the critical value
D.Yes, since the p-value is greater than 0.10
Question 2
The regression line y' = -3 + 2.5 X has been fitted to the data points (28, 60), (20, 50), (10, 18), and (25, 55). The sum of the squared residuals will be:
A.16.00
B.20.25
C.94.25
D.49.00
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Question 3
Outliers are observations that
A.lie outside the sample
B.render the study useless
C.disrupt the entire linear trend
D.lie outside the typical pattern of points
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Question 4
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree?
Pine trees
Spruce trees
Sample size
20
30
Mean trunk diameter (cm)
45
39
Sample variance
100
150
What is the test value for this hypothesis test?
Test value: Round your answer to three decimal places.
What is the critical value?
Critical value: Round your answer to three decimal places.
Question 5
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Data for a sample of 25 apartments in a particular neighborhood are provided below. Using the estimated regression equation found by using size as the predictor variable, find a point estimate for the average monthly rent for apartments having 1,000 square feet of space. Place your answer, rounded to the nearest whole dollar, in th ...
Part 1 of 8 - Question 1 of 171.0 PointsTwo teams of worke.docxherbertwilson5999
Part 1 of 8 -
Question 1 of 17
1.0 Points
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. A random sample of 145 assemblies from team 1 shows 15 unacceptable assemblies. A similar random sample of 125 assemblies from team 2 shows 8 unacceptable assemblies.
Is there sufficient evidence to conclude, at the 10% significance level, that the two teams differ with respect to their proportions of unacceptable assemblies?
A.No, since the test value exceeds the critical value
B.No, since the test value does not exceed the critical value
C.No, since the p-value is less than 0.10
D.Yes, since the p-value is greater than 0.10
Reset Selection
Question 2 of 17
1.0 Points
Q-Mart is interested in comparing its male and female customers. Q-Mart would like to know if the amount of money spent by its female charge customers differs, on average, from the amount spent by its male charge customers.
To answer this question, an analyst collected random samples of 25 female customers and 22 male customers. Based on these samples, on average, the 25 women charge customers spent $102.23 and the 22 men charge customers spent $86.46. Moreover, the sample standard deviation of the amount charged by the 25 women was $93.393, and the sample standard deviation of the amount charged by the 22 men was $59.695.
Using the procedure advocated by Bluman, at the 10% level of significance, is there sufficient evidence for Q-Mart to conclude that, on average, the amount spent by women charge customers differs from the amount spent by men charge customers.
A.No, the p-value of this test is less than 0.10.
B.No, the test value does not exceed the critical value.
C.Yes, the test value does not exceed the critical value
D.Yes, the p-value of this test is greater than 0.10
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Question 3 of 17
1.0 Points
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. Assume α = 0.05. What is the test value?
Women
Men
Sample size
50
80
Mean effect
7
6.95
Sample variance
3
4
A.z = 0.455
B.t = 0.151
C.z = 0.081
D.t = 3.252
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Part 2 of 8 -
Question 4 of 17
1.0 Points
The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars. .
Store
1
2
3
4
5
6
Shelf Space
5
5
5
10
10
10
Weekly Sales
1.6
2.2
1.4
1.9
2.4
2.6
Store
7
8
9
10
11
12
Shelf Space
15
15
15
20
20
20
Weekly Sales
2.3
2.7
2.8
2.6
2.9
3.1
Is the correlation between weekly sales and shelf space significant at the .01 level of significance?
A.No, the sample correlation coefficient does not exceed the critical value.
B.
Yes, the computed t-test statis.
Part 1 of 16 -Question 1 of 231.0 PointsThe data presented i.docxodiliagilby
Part 1 of 16 -
Question 1 of 23
1.0 Points
The data presented in the table below resulted from an experiment in which seeds of 5 different types were planted and the number of seeds that germinated within 5 weeks after planting was recorded for each seed type. At the .01 level of significance, is the proportion of seeds that germinate dependent on the seed type?
Seed Type
Observed Frequencies
Germinated
Failed to Germinate
1
31
7
2
57
33
3
87
60
4
52
44
5
10
19
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Question 2 of 23
1.0 Points
A company operates four machines during three shifts each day. From production records, the data in the table below were collected. At the .05 level of significance test to determine if the number of breakdowns is independent of the shift.
Machine
Shift
A
B
C
D
1
41
20
12
16
2
31
11
9
14
3
15
17
16
10
Reset Selection
Part 2 of 16 -
Question 3 of 23
1.0 Points
In choosing the “best-fitting” line through a set of points in linear regression, we choose the one with the:
Reset Selection
Question 4 of 23
1.0 Points
A single variable X can explain a large percentage of the variation in some other variable Y when the two variables are:
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Question 5 of 23
1.0 Points
A correlation value of zero indicates.
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Part 3 of 16 -
Question 6 of 23
1.0 Points
An investor wants to compare the risks associated with two different stocks. One way to measure the risk of a given stock is to measure the variation in the stock’s daily price changes.
In an effort to test the claim that the variance in the daily stock price changes for stock 1 is different from the variance in the daily stock price changes for stock 2, the investor obtains a random sample of 21 daily price changes for stock 1 and 21 daily price changes for stock 2.
The summary statistics associated with these samples are: n
1
= 21, s
1
= .725, n
2
= 21, s
2
= .529.
If you compute the test value by placing the larger variance in the numerator, at the .05 level of significance, would you conclude that the risks associated with these two stocks are different?
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Question 7 of 23
1.0 Points
Two independent samples of sizes n
1
= 50 and n
2
= 50 are randomly selected from two populations to test the difference between the population means,
. The sampling distribution of the sample mean difference,
is:
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Part 4 of 16 -
Question 8 of 23
1.0 Points
Suppose that the mean time for a certain car to go from 0 to 60 miles per hour was 7.7 seconds. Suppose that you want to test the claim that the average time to accelerate from 0 to 60 miles per hour is longer than 7.7 seconds. What would you use for the alternative hypothesis?
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Question 9 of 23
1.0 Points
A two-tailed test is one where:
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Question 10 of 23
1.0 Points
Which of the following values is not typically used for
?
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Part 5 of 16 -
Question 11 of 23
1.0 Points
From a sample of 500 items, 30 wer.
Question 1 of 151.0 PointsAccepted characters numbers, de.docxmakdul
Question 1 of 15
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Below is the simple crosstab for Beta Blocker use vs. Low HDL. The natural log of the odds ratio [ln(OR)]=
Question 2 of 15
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Using the table from question 1, the standard error of ln(OR)=
Question 3 of 15
1.0 Points
Using the answer for the two previous questions, calculate a 95% CI for OR (Note, you will have to convert your answer from log form before you select an answer).
A. 2.795 - 8.449
B. 1.644 - 14.368
C. 1.028 - 2.134
D. .497 - 2.665
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Question 4 of 15
1.0 Points
In this assignment, you will use the data set “birthwt3.sav”, in homework files under resources. This time we will use the clinical criterion for low birth weight (<2500 grams) to determine whether the baby is of low birth weight. Then you will use logistic regression to examine the effects of risk factors on the chance of a mother having a low birth weight baby. The dataset contains the following variables:
ID: Mother’s identification number
MOTH_AGE: Mother’s age (years)
MOTH_WT: Mother’s weight (pounds)
RACE: Mother’s race (1=White, 2=Black, 3=Other)
dummy variables (Black, White and Other) are already coded in the data set.
SMOKE: Mother’s smoking status (1=Yes, 0=No)
PERM: History of premature labor (number of times)
HYPE: History of hypertension (1=Yes, 0=N0)
URIN_IRR: History of urinary irritation (1=Yes, 0=N0)
PHYS_VIS: Number of physician visits
BIRTH_WT Birth weight of new born (grams)
LBW: Dummy variable, coded 1 if the baby has low birth weight
Run a logistic regression to predict the outcome “LBW” using Smoke, Black and Other as the independent variables. Based on the logistic regression results, match the odds ratio for each of the variables.
A. 3.053
B. 3.030
C. 2.957
1. Smoke
2. Black
3. Other
Question 5 of 15
1.0 Points
We cannot make which of the following conclusions based on the results above?
A. Adjusting for smoking status, the odds of having low birth weight baby for Black women and women of other race is about 3 times the odds for White women.
B. The effect o ...
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VAT Registration Outlined In UAE: Benefits and Requirementsuae taxgpt
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Digital Transformation and IT Strategy Toolkit and TemplatesAurelien Domont, MBA
This Digital Transformation and IT Strategy Toolkit was created by ex-McKinsey, Deloitte and BCG Management Consultants, after more than 5,000 hours of work. It is considered the world's best & most comprehensive Digital Transformation and IT Strategy Toolkit. It includes all the Frameworks, Best Practices & Templates required to successfully undertake the Digital Transformation of your organization and define a robust IT Strategy.
Editable Toolkit to help you reuse our content: 700 Powerpoint slides | 35 Excel sheets | 84 minutes of Video training
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Putting the SPARK into Virtual Training.pptxCynthia Clay
This 60-minute webinar, sponsored by Adobe, was delivered for the Training Mag Network. It explored the five elements of SPARK: Storytelling, Purpose, Action, Relationships, and Kudos. Knowing how to tell a well-structured story is key to building long-term memory. Stating a clear purpose that doesn't take away from the discovery learning process is critical. Ensuring that people move from theory to practical application is imperative. Creating strong social learning is the key to commitment and engagement. Validating and affirming participants' comments is the way to create a positive learning environment.
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Enterprise Excellence is Inclusive Excellence.pdfKaiNexus
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Math 302 midterm exam
1. Buy here:
http://homework.plus/math-302-midterm-exam/
1.Numerical variables can be subdivided into which two types?
2.The probability of an event and the probability of its complement always sum to:
3.If A and B are mutually exclusive events with P(A) = 0.70, then P(B):
4.The binomial probability distribution is used with
5.Which term is NOT synonymous with the expected value of a discrete probability distribution?
6.Find the variance of the following probability distribution.
7.Given that the random variable X is normally distributed with a mean of 80 and a standard
deviation of 10, P(85 < X < 90) is
8.Given that Z is a standard normal variable, the value z for which P(Z < z) = 0.2580 is
9.The standard normal distribution has a mean of ___ and standard deviation of ___,
respectively.
10.The mean of a probability distribution is a:
11.In a normal distribution, changing the standard deviation:
12.One reason for standardizing random variables is to measure variables with:
13.Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-),
spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
2. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A sample of 150 students at a State University was taken after the final business statistics exam
to ask them whether they went partying the weekend before the final or spent the weekend
studying, and whether they did well or poorly on the final. The following table contains the result
14. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Find the mean of the following probability distribution?
15. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data were obtained from a survey of college students. The variable X represents
the number of non-assigned books read during the past six months
3. 16. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
In Major League Baseball there are five teams in the Western Division of the National League:
Arizona, Los Angeles, San Francisco, San Diego, and Colorado. How many different orders of
finish are there for these five teams? Place your answer in the blank. Do not use any decimal
places or commas. For example, 45 would be a legitimate entry
17. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
An ice cream vendor sells three flavors: chocolate, strawberry, and vanilla. Forty five percent of
the sales are chocolate, while 30% are strawberry, with the rest vanilla flavored. Sales are by the
cone or the cup. The percentages of cones sales for chocolate, strawberry, and vanilla, are 75%,
60%, and 40%, respectively. For a randomly selected sale, define the following events:
18. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
4. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A Wendy’s fast-food restaurant sells hamburgers and chicken sandwiches. On a typical
weekday, the demand for hamburgers is normally distributed with a mean of 450 and standard
deviation of 80 and the demand for chicken sandwiches is normally distributed with a mean of
120 and standard deviation of 30.
How many chicken sandwiches must the restaurant stock to be 99% sure of not running out on a
given day? Place you answer, rounded to the nearest whole number in the blank. For example,
345 would be a legitimate entry
19. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline
consumption is mound shaped and symmetric with a mean of 25.9 mpg and a standard deviation
of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by these
30 cars will be greater than 28? Place your answer, rounded to 4 decimal places, in the blank
5. 20. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A Wendy’s fast-food restaurant sells hamburgers and chicken sandwiches. On a typical
weekday, the demand for hamburgers is normally distributed with a mean of 450 and standard
deviation of 80 and the demand for chicken sandwiches is normally distributed with a mean of
120 and standard deviation of 30.
How many hamburgers must the restaurant stock to be 99% sure of not running out on a given
day? Place you answer, rounded to the nearest whole number in the blank. For example, 345
would be a legitimate entry
21. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
6. In a particular region of Cape Cod, it is known that lobstermen trap on average of 32 pounds of
lobster per day with a standard deviation of four pounds. If a random sample of 30 lobster
fishermen is selected, what is the probability that their average catch is less than 31.5 pounds?
Place your answer, rounded to four decimal places, in the blank. 0.2468 When entering your
answer do not use any labels or symbols other than a decimal point. Simply provide the
numerical value. For example, 0.1234 would be a legitimate entry
22. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Suppose that the average weekly earnings for employees in general automotive repair shops is
$450, and that the standard deviation for the weekly earnings for such employees is $50. A
sample of 100 such employees is selected at random.
Find the mean of the sampling distribution of the means of average weekly earnings for samples
of size 100. Place your answer in the blank. Do not include a dollar sign. For example, 123 would
be a legitimate entry
7. 23. Accepted characters: numbers, decimal point markers (period or comma), sign indicators
(-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE:
For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
A popular retail store knows that the purchase amounts by its customers is a random variable
that follows a normal distribution with a mean of $30 and a standard deviation of $9.
What are the two dollar amounts, equidistant from the mean of $30, such that 98% of all
customer purchases are between these values? Place your answers in the blanks provided. Do
not include a dollar sign. For example, 14.25 would be a legitimate entry.
Lower value
Upper value
24. If Z is a standard normal variable, then P(Z = 1) = 0.3413
25. A random variable X is normally distributed with a mean of 175 and a standard deviation of
50. Given that X = 150, its corresponding Z- score is –0.50