1. Approximately 68% of observations are within one standard deviation of the mean if a data set is approximately symmetric and bell-shaped. 2. The document provides practice questions for a statistics quiz covering topics such as standard deviation, mean, median, histograms, and scatter plots. 3. It includes 14 multiple choice questions testing concepts from a statistics course.

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http://homework.plus/math-302-statistics-quiz-1/
1.Suppose that a histogram of a data set is approximately symmetric and "bell shaped".
Approximately what percent of the observations are within one standard deviation of the mean?
2.The average score for a class of 30 students was 75. The 20 male students in the class
averaged 70. The 10 female students in the class averaged:
3.If a variable has possible values –2, 6, and 17, then this variable is
4.Since the population is always larger than the sample, the population mean:
5.A population includes:
6.A time series plot is essentially a:
7.The mode is best described as the
8.A variable is classified as ordinal if:
9.A histogram that has a single peak and looks approximately the same to the left and right of the
peak is called:
10.What kind of relationship between x and y is demonstrated by the scatter plot below?
11.A sample of 20 observations has a standard deviation of 4. The sum of the squared
deviations from the sample mean is:
12.The median can also be described as:

2. 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 an analysis of a set of test scores reveals that: .
Compute the interquartile range. Place your answer, rounded to 1 decimal place, in the blank.
For example, 32.1 would be a legitimate entry
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.
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.

3. 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 78
82 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
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.
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 78

4. 82 78 86 86 82 70 76 78 72 93
What is the median score on this exam? Place your answer, rounded to two decimal places in
the blank. For example, 65.78 would be a legitimate entry
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.
A student scored 84 points on a test where the mean score was 79 and the standard deviation
was 4. Find the student's z score, rounded to 2 decimal places, and place it in the blank
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.

5. 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.
Did
Well
on
Exa
m
Did
Poorl
y on
Exam
Studyin
g for
Exam
60 15
Went
Partying
22 53
If the sample is a good representation of the population, what percentage of those who did poorly
on the final exam should we expect to have spent the weekend studying? Place your answer in
the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44
would be a legitmate answer

6. 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.
The histogram below represents scores achieved by 250 job applicants on a personality profile.
18. A histogram is skewed to the right (or positively skewed) if it has a single peak and the values
of the distribution extend much further to the left of the peak than to the right of the peak.
19. If we draw a straight line through the points in a scatterplot and most of the points fall close to
the line, we say that there is a strong linear relationship between the two variables