4. Performed statistical analysis on a chosen data table and understood relationship amongst different data fields using IBM SPSS software.
Methodologies: Multi linear regression, Logistic linear regression
IBM SPSS
For more classes visit
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1) The main purpose of descriptive statistics is to
2) The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called
3) The performance of personal and business investments is measured as a percentage, return on investment. What type of variable is return on investment?
4. Performed statistical analysis on a chosen data table and understood relationship amongst different data fields using IBM SPSS software.
Methodologies: Multi linear regression, Logistic linear regression
IBM SPSS
For more classes visit
www.snaptutorial.com
1) The main purpose of descriptive statistics is to
2) The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called
3) The performance of personal and business investments is measured as a percentage, return on investment. What type of variable is return on investment?
1Answer the following questions1. Jackson even-numbered C.docxhyacinthshackley2629
1
Answer the following questions:
1. Jackson even-numbered Chapter Exercises (pp. 220-221; 273-275)
2. What are degrees of freedom? How are the calculated?
3. What do inferential statistics allow you to infer?
4. What is the General Linear Model (GLM)? Why does it matter?
5. Compare and contrast parametric and nonparametric statistics. Why and in what types of cases would you use one over the other?
Jackson even-numbered Chapter Exercises (pp. 220-221; 273-275)
Chapter 8/pp. 220-221
2) The producers of a new toothpaste claim that it prevents more cavities that other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 moths. The mean number of cavities at their next checkup is 1.5. In the general population, the mean number of cavities at a 6-month checkup is 1.73 (σ = 1.12).
a. Is this a one- or two-tailed test?
b. What are H0 and Ha for this study?
c. Compare Zobt
d. What is Zcv?
e. Should H0 be rejected? What should the researcher conclude?
f. Determine the 95% confidence interval for the population mean, based on the sample mean.
4) Henry performed a two-tailed test for an experiment in which N=24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to compare his tobt with this tcv. Is he more likely to make Type I or Type II error in this situation?
6) a researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability. Μ = 58. A random sample of 14 individuals who listen to classical music is given the same test. Their scores on the test are 52, 59, 63, 65, 58, 55 62, 63, 53, 59, 61, 60, 59.
a. Is this a one- or two-tailed test?
b. What are H0 and Ha for this study?
c. Compare tobt
d. What is tcv?
e. Should H0 be rejected? What should the researcher conclude?
f. Determine the 95% confidence interval for the population mean, based on the sample mean.
8) A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and finds that the number who exercises regularly is 31 out of 120.
a) What is X2obt?
b) What is the df for this test?
c) What is X2cv?
d) What conclusion should be drawn from these results?
Chapter 10/pp. 273-275
2) A student is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions (he believes that studying under quiet conditions leads to better attention). He randomly participates to either the music or non-music condition and has them read and study the same passage of information for the same amount of time. Subjects are given the same 10-item test on the material. Their scores appear next. Scores on the test represent interval-ratio .
STAT 200 Introduction to Statistics Final Examination, Spri.docxrafaelaj1
STAT 200: Introduction to Statistics
Final Examination, Spring 2019 OL3
Page 1 of 8
STAT 200
OL3 Sections
Final Exam
Spring 2019
The final exam will be posted at 12:01 am on April 19, 2019, and
it is due at 11:59 pm on April 21, 2019 Eastern Time.
This is an open-book exam. You may refer to your text and other course materials
for the current course as you work on the exam, and you may use a calculator,
applets, or Excel. You must complete the exam individually. Neither collaboration
nor consultation with others is allowed. It is a violation of the UMUC Academic
Dishonesty and Plagiarism policy to use unauthorized materials or work from
others.
Answer all 20 questions. Make sure your answers are as complete as possible,
particularly when it asks for you to show your work. Answers that come straight
from calculators, programs or software packages without any explanation will not
be accepted. If you need to use technology (for example, Excel, online or hand-
held calculators, statistical packages) to aid in your calculation, you must cite the
sources and explain how you get the results. For example, state the Excel function
along with the required parameters when using Excel; describe the detailed steps
when using a hand-held calculator; or provide the URL and detailed steps when
using an online calculator, and so on.
Record your answers and work on the separate answer sheet provided.
This exam has 20 problems; 5% for each problems.
You must include the Honor Pledge on the title page of your submitted final exam.
Exams submitted without the Honor Pledge will not be accepted.
STAT 200: Introduction to Statistics
Final Examination, Spring 2019 OL3
Page 2 of 8
1. You wish to estimate the mean cholesterol levels of patients two days after they had a heart attack. To
estimate the mean, you collect data from 28 heart patients. Justify for full credit.
(a) Which of the followings is the sample?
(i) Mean cholesterol levels of 28 patients recovering from a heart attack suffered two
days ago
(ii) Cholesterol level of the person recovering from heart attack suffered two days ago
(iii) Set of all patients recovering from a heart attack suffered two days ago
(iv) Set of 28 patients recovering from a heart attack suffered two days ago
(b) Which of the followings is the variable?
(i) Mean cholesterol levels of 28 patients recovering from a heart attack suffered two
days ago
(ii) Cholesterol level of the person recovering from heart attack suffered two days ago
(iii) Set of all patients recovering from a heart attack suffered two days ago
(iv) Set of 28 patients recovering from a heart attack suffered two days ago
2. In order to collect data on the number of courses that your classmates take in this semester, you plan
on asking them: “How many UMUC courses are you taking in this semester? “Justify for full credit.
(a) Which type of d.
Question 1. [12 marks]Market research has indicated that custo.docxIRESH3
Question 1. [12 marks]
Market research has indicated that customers are likely to bypass Roma tomatoes that weigh less than 70 grams. A produce company produces Roma tomatoes that average 74.0 grams with a standard deviation of 3.2 grams.
(a) [2 marks] Assuming that the normal distribution is a reasonable model for the
weights of these tomatoes, what proportion of Roma tomatoes are currently undersize (less than 70g)?
(b) [2 marks] How much must a Roma tomato weigh to be among the heaviest 10%?
(c ) [2 marks] The aim of the current research is to reduce the proportion of
undersized tomatoes to no more than 2%. One way of reducing this proportion is to reduce the standard deviation. If the average size of the tomatoes remains 74.0 grams, what must the target standard deviation be to achieve the 2% goal?
(d) [3 marks] The company claims that the goal of 2% undersized tomatoes is
reached.To test this, a random sample of 25 tomatoes is taken. What is the
distribution of undersized tomatoes in this sample if the company's claim is true?
Explain your reasoning.
Question 2:
In an article in Marketing Science, Silk and Berndt investigate the output of advertising agencies. They describe ad agency output by finding the shares of dollar billing volume coming from various media categories such as network television, spot television, newspaper, radio, and so forth.
Suppose that a random sample of 400 U.S. advertising agencies gives an average percentage share of billing volume from network television equal to 7.46 percent with a standard deviation of 1.42 percent. Further, suppose that a random sample of 400 U.S. advertising agencies gives an average percentage share of billing volume from spot television commercials equal to 12.44 percent with a standard deviation of 1.55 percent.
Using the sample information, does it appear that the mean percentage share of billing volume from spot television commercials for the U.S. advertising agencies is greater than the mean percentage share of billing volume from network television? Explain.
Module #3: Sampling Distributions, Estimates, and Hypothesis Testing
Question 3:
[3] Identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.
a) The instructor of this course observed at a Walnut Creek Police sobriety checkpoint at which every fifth driver was stopped and interviewed. Some drivers were arrested.
b) The instructor of this course observed professional wine tasters working at a winery in Napa Valley, CA. Assume that a taste test involved three different wines randomly selected from each of five different wineries.
c) The U.S. Department of Corrections collects data about returning prisoners by randomly selecting five federal prisons and surveying all of the prisoners in each of the prisons.
d) In a Gallup poll, 1003 adults were called after their telephone numbers were randomly generated by a computer, and 20% of t ...
Exam 1 (covers Chapters 1-7)Math 140Show all work! Na.docxSANSKAR20
Exam 1 (covers Chapters 1-7)
Math 140
Show all work! Name:______________________________
Seat number:____________________________
Papers without name and/or seating number will loose 10 points of total possible. Write your complete name and seat number now. Each problem or part has 5 points.
1) Because elderly people may have difficulty standing to have their heights measured, a study looked at predicting overall height from height to the knee. Here are data (in centimeters) for six elderly
Knee height x
57.6
46.4
43.5
44.8
52.2
54.6
Height y
192.1
152.3
146.4
162.7
174.1
177.8
Use your calculator: The correlation between knee height and overall height is about
(a) r =0.08. (b) r =0.89. (c) r =0.74 (d) none of the above
2) The National Association of College and University Business Officers collects data on college endowments. In 2011, 834 colleges and universities reported the value of their endowments. When the endowment values are arranged in order, what are the locations of the median and the quartiles in this ordered list?
Select the correct statement: If a distribution is skewed to the left,
(a) the mean is less than the median.
(b) the mean and median are equal.
(c) the mean is greater than the median.
(d) none of the above
3) A recent study found that consuming more fast food, candy and soda was not correlated with higher body mass index (BMI). This indicates that:
(a) People with higher BMIs tend to consume more fast food than people with lower BMIs
(b) People with higher BMIs tend to consume less fast food than people with lower BMIs
(c) The more fast food a person tends to consume, the higher their BMI tends to be
(d) The more fast food a person tends to consume, the lower their BMI tends to be
(e) None of the above
Use these data for the next two problems: In a usual way to study the brain’s response to sounds is to have subjects listen to pure tones. They fed pure tone and also monkey calls directly to their brains by inserting electrodes.
neuron
1
2
3
4
5
6
7
8
9
10
11
12
tone
474
256
241
226
185
174
176
168
161
150
19
20
call
500
138
485
338
194
159
341
85
303
208
66
54
neuron
13
14
15
16
17
18
19
20
tone
35
145
141
129
113
112
102
100
call
103
42
241
194
123
182
141
118
4) We might expect some neurons to have strong responses to any stimulus and others to have consistently weak responses. There would then be a strong relationship between tone response and call response. From the scatterplot of monkey call response against pure-tone response what would you estimate the correlation r to be?
(a) -0.6 (b) -0.1 (c) 0.1 (d) 0.6
5) Which of the following statements about the scatterplot given above is correct?
(a) There is moderate evidence that pure-tone response cause monkey call response.
(b) There is moderate evidence that monkey call response cause pure-tone response.
(c) There are one or two outliers, and at least one of these may also be influential.
(d) None of the ab ...
AbstractKnowledge-Based computerized management information syst.docxSALU18
Abstract
Knowledge-Based computerized management information systems could help to reduce potential problems in the administrative decision-making process.
· Clearly state what the article is about and its purpose
The purpose of this paper is to demonstrate the advantages of the Knowledge-Based computerized management information system in the decision-making process. Research shows that it can be used to build the business intelligent decision-making system and help to reduce the potential problems. This article also explained the definition of MIS, various types of MIS, and the effectiveness of MIS which helped me to better understand what management information system is and why it is important.
· How the article and/or author(s) support your argument(s)
In my PA 1 paper, I will identify some research areas in management information system. Business intelligence mentioned in this article is one of the research areas that I will identify in my paper. I will use the information in this article to discuss the benefit for the organization to use the business intelligent decision-making systems such as increasing the productivity.
· Most important aspects of the article
Knowledge-based information systems are dynamic where it was developed designed and program during the of training and learning. From the experience and knowledge, they gained from training, they could differentiate patterns, handwritten symbols, word recognition, forecasting, and other applications especially in business and finance area.
· Any findings and conclusions
Organization should use knowledge-based information systems in decision-making process. Create frameworks that can utilize modern information technology applications at differed administrative levels. Take advantages of benefits provided by the existing knowledge-based information systems in terms of effort, time and money and to be able to adapt to the conditions and environmental changes
· Include the industry example demonstrating the application of your researched article
Applicable for all of the business industries especially financial institutions.
References
Amuna, Y. M. A., Al Shobaki, M. J., & Naser, S. S. A. (2017). The Role of Knowledge-Based Computerized Management Information Systems in the Administrative Decision-Making Process.
MTH 101M7-8 Collecting and Analyzing Data
Show all work to receive credit. Write verbal questions in at least one complete sentence.
1) For each of the following questions, decide if the data is qualitative or quantitative. If it is quantitative, decide if it’s discrete or continuous. Explain the reason for your answer.
a) Janelle is collecting data on the number of ounces of water drank by college students during a typical math class. What type of data is this?
b) Terrance is collecting data on the color of cars in the school parking lot. What type of data is this?
c) Tina is collecting data on the number of goals scored in college soccer games from around th.
AbstractKnowledge-Based computerized management information syst.docxronak56
Abstract
Knowledge-Based computerized management information systems could help to reduce potential problems in the administrative decision-making process.
· Clearly state what the article is about and its purpose
The purpose of this paper is to demonstrate the advantages of the Knowledge-Based computerized management information system in the decision-making process. Research shows that it can be used to build the business intelligent decision-making system and help to reduce the potential problems. This article also explained the definition of MIS, various types of MIS, and the effectiveness of MIS which helped me to better understand what management information system is and why it is important.
· How the article and/or author(s) support your argument(s)
In my PA 1 paper, I will identify some research areas in management information system. Business intelligence mentioned in this article is one of the research areas that I will identify in my paper. I will use the information in this article to discuss the benefit for the organization to use the business intelligent decision-making systems such as increasing the productivity.
· Most important aspects of the article
Knowledge-based information systems are dynamic where it was developed designed and program during the of training and learning. From the experience and knowledge, they gained from training, they could differentiate patterns, handwritten symbols, word recognition, forecasting, and other applications especially in business and finance area.
· Any findings and conclusions
Organization should use knowledge-based information systems in decision-making process. Create frameworks that can utilize modern information technology applications at differed administrative levels. Take advantages of benefits provided by the existing knowledge-based information systems in terms of effort, time and money and to be able to adapt to the conditions and environmental changes
· Include the industry example demonstrating the application of your researched article
Applicable for all of the business industries especially financial institutions.
References
Amuna, Y. M. A., Al Shobaki, M. J., & Naser, S. S. A. (2017). The Role of Knowledge-Based Computerized Management Information Systems in the Administrative Decision-Making Process.
MTH 101M7-8 Collecting and Analyzing Data
Show all work to receive credit. Write verbal questions in at least one complete sentence.
1) For each of the following questions, decide if the data is qualitative or quantitative. If it is quantitative, decide if it’s discrete or continuous. Explain the reason for your answer.
a) Janelle is collecting data on the number of ounces of water drank by college students during a typical math class. What type of data is this?
b) Terrance is collecting data on the color of cars in the school parking lot. What type of data is this?
c) Tina is collecting data on the number of goals scored in college soccer games from around th.
For more course tutorials visit
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QNT 565 Week 1 Individual Assignment Business Research Case Study
QNT 565 Week 1 DQ 1
QNT 565 Week 1 DQ 2
QNT 565 Week 2 Learning Team Assignment Research Proposal Part I
For more course tutorials visit
www.newtonhelp.com
QNT 565 Week 1 Individual Assignment Business Research Case Study
QNT 565 Week 1 DQ 1
QNT 565 Week 1 DQ 2
QNT 565 Week 2 Learning Team Assignment Research Proposal Part I
About Your Signature AssignmentThis signature assignment is de.docxransayo
About Your Signature Assignment
This signature assignment is designed to align with specific program student learning outcome(s) in your program. Program Student Learning Outcomes are broad statements that describe what students should know and be able to do upon completion of their degree. The signature assignments might be graded with an automated rubric that allows the University to collect data that can be aggregated across a location or college/school and used for program improvements.
Purpose of Assignment
The purpose of this assignment is for students to synthesize the concepts learned throughout the course. This assignment will provide students an opportunity to build critical thinking skills, develop businesses and organizations, and solve problems requiring data by compiling all pertinent information into one report.
Assignment Steps
Resources: Microsoft Excel®, Signature Assignment Databases, Signature Assignment Options, Part 3: Inferential Statistics
Scenario: Upon successful completion of the MBA program, say you work in the analytics department for a consulting company. Your assignment is to analyze one of the following databases:
· Manufacturing
· Hospital
· Consumer Food
· Financial
Select one of the databases based on the information in the Signature Assignment Options.
Provide a 12 paragraphs each 150 words statistical report including the following:
· Explain the context of the case
· Provide a research foundation for the topic
· Present graphs
· Explain outliers
· Prepare calculations
· Conduct hypotheses tests
· Discuss inferences you have made from the results
This assignment is broken down into four parts:
· Part 1 - Preliminary Analysis
· Part 2 - Examination of Descriptive Statistics
· Part 3 - Examination of Inferential Statistics
· Part 4 - Conclusion/Recommendations
Part 1 - Preliminary Analysis (3-4 paragraphs)
Generally, as a statistics consultant, you will be given a problem and data. At times, you may have to gather additional data. For this assignment, assume all the data is already gathered for you.
State the objective:
· What are the questions you are trying to address?
Describe the population in the study clearly and in sufficient detail:
· What is the sample?
Discuss the types of data and variables:
· Are the data quantitative or qualitative?
· What are levels of measurement for the data?
Part 2 - Descriptive Statistics (3-4 paragraphs)
Examine the given data.
Present the descriptive statistics (mean, median, mode, range, standard deviation, variance, CV, and five-number summary).
Identify any outliers in the data.
Present any graphs or charts you think are appropriate for the data.
Note: Ideally, we want to assess the conditions of normality too. However, for the purpose of this exercise, assume data is drawn from normal populations.
Part 3 - Inferential Statistics (2-3 paragraphs)
Use the Part 3: Inferential Statistics document.
· Create (formulate) hypotheses
· Run formal hyp.
Experience Mazda Zoom Zoom Lifestyle and Culture by Visiting and joining the Official Mazda Community at http://www.MazdaCommunity.org for additional insight into the Zoom Zoom Lifestyle and special offers for Mazda Community Members. If you live in Arizona, check out CardinaleWay Mazda's eCommerce website at http://www.Cardinale-Way-Mazda.com
QNT 561 GENIUS Become Exceptional--qnt561genius.comclaric135
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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon.
2. What conditions must n satisfy to make the x2 test valid?
3. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples?
FOR MORE CLASSES VISIT
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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon.
2. What conditions must n satisfy to make the x2 test valid?
3. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations
As mentioned earlier, the mid-term will have conceptual and quanti.docxfredharris32
As mentioned earlier, the mid-term will have conceptual and quantitative multiple-choice questions. You need to read all 4 chapters and you need to be able to solve problems in all 4 chapters in order to do well in this test.
The following are for review and learning purposes only. I am not indicating that identical or similar problems will be in the test. As I have indicated in the class syllabus, all the exams in this course will have multiple-choice questions and problems.
Suggestion: treat this review set as you would an actual test. Sit down with your one page of notes and your calculator, and give it a try. That way you will know what areas you still need to study.
ADMN 210
Answers to Review for Midterm #1
1) Classify each of the following as nominal, ordinal, interval, or ratio data.
a. The time required to produce each tire on an assembly line – ratio since it is numeric with a valid 0 point meaning “lack of”
b. The number of quarts of milk a family drinks in a month - ratio since it is numeric with a valid 0 point meaning “lack of”
c. The ranking of four machines in your plant after they have been designated as excellent, good, satisfactory, and poor – ordinal since it is ranking data only
d. The telephone area code of clients in the United States – nominal since it is a label
e. The age of each of your employees - ratio since it is numeric with a valid 0 point meaning “lack of”
f. The dollar sales at the local pizza house each month - ratio since it is numeric with a valid 0 point meaning “lack of”
g. An employee’s identification number – nominal since it is a label
h. The response time of an emergency unit - ratio since it is numeric with a valid 0 point meaning “lack of”
2) True or False: The highest level of data measurement is the ratio-level measurement.
True (you can do the most powerful analysis with this kind of data)
3) True or False: Interval- and ratio-level data are also referred to as categorical data.
False (Interval and ratio level data are numeric and therefore quantitative, NOT qualitative….Nominal is qualitative)
4) A small portion or a subset of the population on which data is collected for conducting statistical analysis is called __________.
A sample! A population is the total group, a census IS the population, and a data set can be either a sample or a population.
5) One of the advantages for taking a sample instead of conducting a census is this:
a sample is more accurate than census
a sample is difficult to take
a sample cannot be trusted
a sample can save money when data collection process is destructive
6) Selection of the winning numbers is a lottery is an example of __________.
convenience sampling
random sampling
nonrandom sampling
regulatory sampling
7) A type of random sampling in which the population is divided into non-overlapping subpopulations is called __________.
stratified random sampling
cluster sampling
systematic random sampling
regulatory sampling
8) A ...
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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon.
QNT 351 PAPER Education for Service--qnt351paper.commamata53
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Q1 The Director of Golf for a local course wants to study the number of rounds played by members on weekdays. He gathered the sample information shown below for 520 rounds. At the .05 significance level, is there a difference in the number of rounds played by day of the week?
1Answer the following questions1. Jackson even-numbered C.docxhyacinthshackley2629
1
Answer the following questions:
1. Jackson even-numbered Chapter Exercises (pp. 220-221; 273-275)
2. What are degrees of freedom? How are the calculated?
3. What do inferential statistics allow you to infer?
4. What is the General Linear Model (GLM)? Why does it matter?
5. Compare and contrast parametric and nonparametric statistics. Why and in what types of cases would you use one over the other?
Jackson even-numbered Chapter Exercises (pp. 220-221; 273-275)
Chapter 8/pp. 220-221
2) The producers of a new toothpaste claim that it prevents more cavities that other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 moths. The mean number of cavities at their next checkup is 1.5. In the general population, the mean number of cavities at a 6-month checkup is 1.73 (σ = 1.12).
a. Is this a one- or two-tailed test?
b. What are H0 and Ha for this study?
c. Compare Zobt
d. What is Zcv?
e. Should H0 be rejected? What should the researcher conclude?
f. Determine the 95% confidence interval for the population mean, based on the sample mean.
4) Henry performed a two-tailed test for an experiment in which N=24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to compare his tobt with this tcv. Is he more likely to make Type I or Type II error in this situation?
6) a researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability. Μ = 58. A random sample of 14 individuals who listen to classical music is given the same test. Their scores on the test are 52, 59, 63, 65, 58, 55 62, 63, 53, 59, 61, 60, 59.
a. Is this a one- or two-tailed test?
b. What are H0 and Ha for this study?
c. Compare tobt
d. What is tcv?
e. Should H0 be rejected? What should the researcher conclude?
f. Determine the 95% confidence interval for the population mean, based on the sample mean.
8) A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and finds that the number who exercises regularly is 31 out of 120.
a) What is X2obt?
b) What is the df for this test?
c) What is X2cv?
d) What conclusion should be drawn from these results?
Chapter 10/pp. 273-275
2) A student is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions (he believes that studying under quiet conditions leads to better attention). He randomly participates to either the music or non-music condition and has them read and study the same passage of information for the same amount of time. Subjects are given the same 10-item test on the material. Their scores appear next. Scores on the test represent interval-ratio .
STAT 200 Introduction to Statistics Final Examination, Spri.docxrafaelaj1
STAT 200: Introduction to Statistics
Final Examination, Spring 2019 OL3
Page 1 of 8
STAT 200
OL3 Sections
Final Exam
Spring 2019
The final exam will be posted at 12:01 am on April 19, 2019, and
it is due at 11:59 pm on April 21, 2019 Eastern Time.
This is an open-book exam. You may refer to your text and other course materials
for the current course as you work on the exam, and you may use a calculator,
applets, or Excel. You must complete the exam individually. Neither collaboration
nor consultation with others is allowed. It is a violation of the UMUC Academic
Dishonesty and Plagiarism policy to use unauthorized materials or work from
others.
Answer all 20 questions. Make sure your answers are as complete as possible,
particularly when it asks for you to show your work. Answers that come straight
from calculators, programs or software packages without any explanation will not
be accepted. If you need to use technology (for example, Excel, online or hand-
held calculators, statistical packages) to aid in your calculation, you must cite the
sources and explain how you get the results. For example, state the Excel function
along with the required parameters when using Excel; describe the detailed steps
when using a hand-held calculator; or provide the URL and detailed steps when
using an online calculator, and so on.
Record your answers and work on the separate answer sheet provided.
This exam has 20 problems; 5% for each problems.
You must include the Honor Pledge on the title page of your submitted final exam.
Exams submitted without the Honor Pledge will not be accepted.
STAT 200: Introduction to Statistics
Final Examination, Spring 2019 OL3
Page 2 of 8
1. You wish to estimate the mean cholesterol levels of patients two days after they had a heart attack. To
estimate the mean, you collect data from 28 heart patients. Justify for full credit.
(a) Which of the followings is the sample?
(i) Mean cholesterol levels of 28 patients recovering from a heart attack suffered two
days ago
(ii) Cholesterol level of the person recovering from heart attack suffered two days ago
(iii) Set of all patients recovering from a heart attack suffered two days ago
(iv) Set of 28 patients recovering from a heart attack suffered two days ago
(b) Which of the followings is the variable?
(i) Mean cholesterol levels of 28 patients recovering from a heart attack suffered two
days ago
(ii) Cholesterol level of the person recovering from heart attack suffered two days ago
(iii) Set of all patients recovering from a heart attack suffered two days ago
(iv) Set of 28 patients recovering from a heart attack suffered two days ago
2. In order to collect data on the number of courses that your classmates take in this semester, you plan
on asking them: “How many UMUC courses are you taking in this semester? “Justify for full credit.
(a) Which type of d.
Question 1. [12 marks]Market research has indicated that custo.docxIRESH3
Question 1. [12 marks]
Market research has indicated that customers are likely to bypass Roma tomatoes that weigh less than 70 grams. A produce company produces Roma tomatoes that average 74.0 grams with a standard deviation of 3.2 grams.
(a) [2 marks] Assuming that the normal distribution is a reasonable model for the
weights of these tomatoes, what proportion of Roma tomatoes are currently undersize (less than 70g)?
(b) [2 marks] How much must a Roma tomato weigh to be among the heaviest 10%?
(c ) [2 marks] The aim of the current research is to reduce the proportion of
undersized tomatoes to no more than 2%. One way of reducing this proportion is to reduce the standard deviation. If the average size of the tomatoes remains 74.0 grams, what must the target standard deviation be to achieve the 2% goal?
(d) [3 marks] The company claims that the goal of 2% undersized tomatoes is
reached.To test this, a random sample of 25 tomatoes is taken. What is the
distribution of undersized tomatoes in this sample if the company's claim is true?
Explain your reasoning.
Question 2:
In an article in Marketing Science, Silk and Berndt investigate the output of advertising agencies. They describe ad agency output by finding the shares of dollar billing volume coming from various media categories such as network television, spot television, newspaper, radio, and so forth.
Suppose that a random sample of 400 U.S. advertising agencies gives an average percentage share of billing volume from network television equal to 7.46 percent with a standard deviation of 1.42 percent. Further, suppose that a random sample of 400 U.S. advertising agencies gives an average percentage share of billing volume from spot television commercials equal to 12.44 percent with a standard deviation of 1.55 percent.
Using the sample information, does it appear that the mean percentage share of billing volume from spot television commercials for the U.S. advertising agencies is greater than the mean percentage share of billing volume from network television? Explain.
Module #3: Sampling Distributions, Estimates, and Hypothesis Testing
Question 3:
[3] Identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.
a) The instructor of this course observed at a Walnut Creek Police sobriety checkpoint at which every fifth driver was stopped and interviewed. Some drivers were arrested.
b) The instructor of this course observed professional wine tasters working at a winery in Napa Valley, CA. Assume that a taste test involved three different wines randomly selected from each of five different wineries.
c) The U.S. Department of Corrections collects data about returning prisoners by randomly selecting five federal prisons and surveying all of the prisoners in each of the prisons.
d) In a Gallup poll, 1003 adults were called after their telephone numbers were randomly generated by a computer, and 20% of t ...
Exam 1 (covers Chapters 1-7)Math 140Show all work! Na.docxSANSKAR20
Exam 1 (covers Chapters 1-7)
Math 140
Show all work! Name:______________________________
Seat number:____________________________
Papers without name and/or seating number will loose 10 points of total possible. Write your complete name and seat number now. Each problem or part has 5 points.
1) Because elderly people may have difficulty standing to have their heights measured, a study looked at predicting overall height from height to the knee. Here are data (in centimeters) for six elderly
Knee height x
57.6
46.4
43.5
44.8
52.2
54.6
Height y
192.1
152.3
146.4
162.7
174.1
177.8
Use your calculator: The correlation between knee height and overall height is about
(a) r =0.08. (b) r =0.89. (c) r =0.74 (d) none of the above
2) The National Association of College and University Business Officers collects data on college endowments. In 2011, 834 colleges and universities reported the value of their endowments. When the endowment values are arranged in order, what are the locations of the median and the quartiles in this ordered list?
Select the correct statement: If a distribution is skewed to the left,
(a) the mean is less than the median.
(b) the mean and median are equal.
(c) the mean is greater than the median.
(d) none of the above
3) A recent study found that consuming more fast food, candy and soda was not correlated with higher body mass index (BMI). This indicates that:
(a) People with higher BMIs tend to consume more fast food than people with lower BMIs
(b) People with higher BMIs tend to consume less fast food than people with lower BMIs
(c) The more fast food a person tends to consume, the higher their BMI tends to be
(d) The more fast food a person tends to consume, the lower their BMI tends to be
(e) None of the above
Use these data for the next two problems: In a usual way to study the brain’s response to sounds is to have subjects listen to pure tones. They fed pure tone and also monkey calls directly to their brains by inserting electrodes.
neuron
1
2
3
4
5
6
7
8
9
10
11
12
tone
474
256
241
226
185
174
176
168
161
150
19
20
call
500
138
485
338
194
159
341
85
303
208
66
54
neuron
13
14
15
16
17
18
19
20
tone
35
145
141
129
113
112
102
100
call
103
42
241
194
123
182
141
118
4) We might expect some neurons to have strong responses to any stimulus and others to have consistently weak responses. There would then be a strong relationship between tone response and call response. From the scatterplot of monkey call response against pure-tone response what would you estimate the correlation r to be?
(a) -0.6 (b) -0.1 (c) 0.1 (d) 0.6
5) Which of the following statements about the scatterplot given above is correct?
(a) There is moderate evidence that pure-tone response cause monkey call response.
(b) There is moderate evidence that monkey call response cause pure-tone response.
(c) There are one or two outliers, and at least one of these may also be influential.
(d) None of the ab ...
AbstractKnowledge-Based computerized management information syst.docxSALU18
Abstract
Knowledge-Based computerized management information systems could help to reduce potential problems in the administrative decision-making process.
· Clearly state what the article is about and its purpose
The purpose of this paper is to demonstrate the advantages of the Knowledge-Based computerized management information system in the decision-making process. Research shows that it can be used to build the business intelligent decision-making system and help to reduce the potential problems. This article also explained the definition of MIS, various types of MIS, and the effectiveness of MIS which helped me to better understand what management information system is and why it is important.
· How the article and/or author(s) support your argument(s)
In my PA 1 paper, I will identify some research areas in management information system. Business intelligence mentioned in this article is one of the research areas that I will identify in my paper. I will use the information in this article to discuss the benefit for the organization to use the business intelligent decision-making systems such as increasing the productivity.
· Most important aspects of the article
Knowledge-based information systems are dynamic where it was developed designed and program during the of training and learning. From the experience and knowledge, they gained from training, they could differentiate patterns, handwritten symbols, word recognition, forecasting, and other applications especially in business and finance area.
· Any findings and conclusions
Organization should use knowledge-based information systems in decision-making process. Create frameworks that can utilize modern information technology applications at differed administrative levels. Take advantages of benefits provided by the existing knowledge-based information systems in terms of effort, time and money and to be able to adapt to the conditions and environmental changes
· Include the industry example demonstrating the application of your researched article
Applicable for all of the business industries especially financial institutions.
References
Amuna, Y. M. A., Al Shobaki, M. J., & Naser, S. S. A. (2017). The Role of Knowledge-Based Computerized Management Information Systems in the Administrative Decision-Making Process.
MTH 101M7-8 Collecting and Analyzing Data
Show all work to receive credit. Write verbal questions in at least one complete sentence.
1) For each of the following questions, decide if the data is qualitative or quantitative. If it is quantitative, decide if it’s discrete or continuous. Explain the reason for your answer.
a) Janelle is collecting data on the number of ounces of water drank by college students during a typical math class. What type of data is this?
b) Terrance is collecting data on the color of cars in the school parking lot. What type of data is this?
c) Tina is collecting data on the number of goals scored in college soccer games from around th.
AbstractKnowledge-Based computerized management information syst.docxronak56
Abstract
Knowledge-Based computerized management information systems could help to reduce potential problems in the administrative decision-making process.
· Clearly state what the article is about and its purpose
The purpose of this paper is to demonstrate the advantages of the Knowledge-Based computerized management information system in the decision-making process. Research shows that it can be used to build the business intelligent decision-making system and help to reduce the potential problems. This article also explained the definition of MIS, various types of MIS, and the effectiveness of MIS which helped me to better understand what management information system is and why it is important.
· How the article and/or author(s) support your argument(s)
In my PA 1 paper, I will identify some research areas in management information system. Business intelligence mentioned in this article is one of the research areas that I will identify in my paper. I will use the information in this article to discuss the benefit for the organization to use the business intelligent decision-making systems such as increasing the productivity.
· Most important aspects of the article
Knowledge-based information systems are dynamic where it was developed designed and program during the of training and learning. From the experience and knowledge, they gained from training, they could differentiate patterns, handwritten symbols, word recognition, forecasting, and other applications especially in business and finance area.
· Any findings and conclusions
Organization should use knowledge-based information systems in decision-making process. Create frameworks that can utilize modern information technology applications at differed administrative levels. Take advantages of benefits provided by the existing knowledge-based information systems in terms of effort, time and money and to be able to adapt to the conditions and environmental changes
· Include the industry example demonstrating the application of your researched article
Applicable for all of the business industries especially financial institutions.
References
Amuna, Y. M. A., Al Shobaki, M. J., & Naser, S. S. A. (2017). The Role of Knowledge-Based Computerized Management Information Systems in the Administrative Decision-Making Process.
MTH 101M7-8 Collecting and Analyzing Data
Show all work to receive credit. Write verbal questions in at least one complete sentence.
1) For each of the following questions, decide if the data is qualitative or quantitative. If it is quantitative, decide if it’s discrete or continuous. Explain the reason for your answer.
a) Janelle is collecting data on the number of ounces of water drank by college students during a typical math class. What type of data is this?
b) Terrance is collecting data on the color of cars in the school parking lot. What type of data is this?
c) Tina is collecting data on the number of goals scored in college soccer games from around th.
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QNT 565 Week 1 Individual Assignment Business Research Case Study
QNT 565 Week 1 DQ 1
QNT 565 Week 1 DQ 2
QNT 565 Week 2 Learning Team Assignment Research Proposal Part I
For more course tutorials visit
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QNT 565 Week 1 Individual Assignment Business Research Case Study
QNT 565 Week 1 DQ 1
QNT 565 Week 1 DQ 2
QNT 565 Week 2 Learning Team Assignment Research Proposal Part I
About Your Signature AssignmentThis signature assignment is de.docxransayo
About Your Signature Assignment
This signature assignment is designed to align with specific program student learning outcome(s) in your program. Program Student Learning Outcomes are broad statements that describe what students should know and be able to do upon completion of their degree. The signature assignments might be graded with an automated rubric that allows the University to collect data that can be aggregated across a location or college/school and used for program improvements.
Purpose of Assignment
The purpose of this assignment is for students to synthesize the concepts learned throughout the course. This assignment will provide students an opportunity to build critical thinking skills, develop businesses and organizations, and solve problems requiring data by compiling all pertinent information into one report.
Assignment Steps
Resources: Microsoft Excel®, Signature Assignment Databases, Signature Assignment Options, Part 3: Inferential Statistics
Scenario: Upon successful completion of the MBA program, say you work in the analytics department for a consulting company. Your assignment is to analyze one of the following databases:
· Manufacturing
· Hospital
· Consumer Food
· Financial
Select one of the databases based on the information in the Signature Assignment Options.
Provide a 12 paragraphs each 150 words statistical report including the following:
· Explain the context of the case
· Provide a research foundation for the topic
· Present graphs
· Explain outliers
· Prepare calculations
· Conduct hypotheses tests
· Discuss inferences you have made from the results
This assignment is broken down into four parts:
· Part 1 - Preliminary Analysis
· Part 2 - Examination of Descriptive Statistics
· Part 3 - Examination of Inferential Statistics
· Part 4 - Conclusion/Recommendations
Part 1 - Preliminary Analysis (3-4 paragraphs)
Generally, as a statistics consultant, you will be given a problem and data. At times, you may have to gather additional data. For this assignment, assume all the data is already gathered for you.
State the objective:
· What are the questions you are trying to address?
Describe the population in the study clearly and in sufficient detail:
· What is the sample?
Discuss the types of data and variables:
· Are the data quantitative or qualitative?
· What are levels of measurement for the data?
Part 2 - Descriptive Statistics (3-4 paragraphs)
Examine the given data.
Present the descriptive statistics (mean, median, mode, range, standard deviation, variance, CV, and five-number summary).
Identify any outliers in the data.
Present any graphs or charts you think are appropriate for the data.
Note: Ideally, we want to assess the conditions of normality too. However, for the purpose of this exercise, assume data is drawn from normal populations.
Part 3 - Inferential Statistics (2-3 paragraphs)
Use the Part 3: Inferential Statistics document.
· Create (formulate) hypotheses
· Run formal hyp.
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QNT 561 GENIUS Become Exceptional--qnt561genius.comclaric135
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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon.
2. What conditions must n satisfy to make the x2 test valid?
3. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples?
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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon.
2. What conditions must n satisfy to make the x2 test valid?
3. To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations
As mentioned earlier, the mid-term will have conceptual and quanti.docxfredharris32
As mentioned earlier, the mid-term will have conceptual and quantitative multiple-choice questions. You need to read all 4 chapters and you need to be able to solve problems in all 4 chapters in order to do well in this test.
The following are for review and learning purposes only. I am not indicating that identical or similar problems will be in the test. As I have indicated in the class syllabus, all the exams in this course will have multiple-choice questions and problems.
Suggestion: treat this review set as you would an actual test. Sit down with your one page of notes and your calculator, and give it a try. That way you will know what areas you still need to study.
ADMN 210
Answers to Review for Midterm #1
1) Classify each of the following as nominal, ordinal, interval, or ratio data.
a. The time required to produce each tire on an assembly line – ratio since it is numeric with a valid 0 point meaning “lack of”
b. The number of quarts of milk a family drinks in a month - ratio since it is numeric with a valid 0 point meaning “lack of”
c. The ranking of four machines in your plant after they have been designated as excellent, good, satisfactory, and poor – ordinal since it is ranking data only
d. The telephone area code of clients in the United States – nominal since it is a label
e. The age of each of your employees - ratio since it is numeric with a valid 0 point meaning “lack of”
f. The dollar sales at the local pizza house each month - ratio since it is numeric with a valid 0 point meaning “lack of”
g. An employee’s identification number – nominal since it is a label
h. The response time of an emergency unit - ratio since it is numeric with a valid 0 point meaning “lack of”
2) True or False: The highest level of data measurement is the ratio-level measurement.
True (you can do the most powerful analysis with this kind of data)
3) True or False: Interval- and ratio-level data are also referred to as categorical data.
False (Interval and ratio level data are numeric and therefore quantitative, NOT qualitative….Nominal is qualitative)
4) A small portion or a subset of the population on which data is collected for conducting statistical analysis is called __________.
A sample! A population is the total group, a census IS the population, and a data set can be either a sample or a population.
5) One of the advantages for taking a sample instead of conducting a census is this:
a sample is more accurate than census
a sample is difficult to take
a sample cannot be trusted
a sample can save money when data collection process is destructive
6) Selection of the winning numbers is a lottery is an example of __________.
convenience sampling
random sampling
nonrandom sampling
regulatory sampling
7) A type of random sampling in which the population is divided into non-overlapping subpopulations is called __________.
stratified random sampling
cluster sampling
systematic random sampling
regulatory sampling
8) A ...
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1. The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon.
QNT 351 PAPER Education for Service--qnt351paper.commamata53
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Q1 The Director of Golf for a local course wants to study the number of rounds played by members on weekdays. He gathered the sample information shown below for 520 rounds. At the .05 significance level, is there a difference in the number of rounds played by day of the week?
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
1. MTH 540 Learning Team Assignment Analysis of Performance of
Humidity Indicator Cards Paper and Presentation
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MTH 540 Learning Team Assignment Analysis of Performance of
Humidity Indicator Cards Paper and Presentation
=====================
MTH 540 Week 1 Individual Assignment Problem Set
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1. Identify the population and the sample in the following study.
A study of 163 patients with sleep disorders was conducted to find
a link between obesity and sleep disorders. (Source:Archives of
Internal Medicine 1998)
2. Determine whether the numerical value is a parameter or a
statistic.
(a) In a survey of a sample of parents, 53% said they protect their
children from sun exposure using sunscreen. (Source: Morbidity
and Mortality Weekly Report)
(b) In a union’s vote, 67% of all union members voted to ratify a
contract proposal.
2. 3. Determine whether the data are qualitative or quantitative.
(a) A database of student identification numbers
(b) The test scores in a statistics class
6. Identify which sampling technique was used in each study.
Explain your reasoning.
(a) A journalist goes to a beach to ask people how they feel about
water pollution
(b) For quality assurance, every fifth engine part is selected from
an assembly line and tested for durability.
(c) A study on attitudes about smoking is conducted at a college.
The students are divided by class (freshman, sophomore, junior,
and senior). Then a random sample is selected from each class and
interviewed.
7. Which sampling technique used in Exercise 6 could lead to a
biased study?
8. Determine whether each statement is true or false. If it is false,
rewrite it as a true statement.
(a) A parameter is a numerical measure that describes a sample
characteristic.
(b) Ordinal data represent the highest level of measurement.
p. 6-7 #9-12, 17-20
In Exercises 9–12, determine whether the data set is a population
or a sample. Explain your reasoning.
9. The age of each state governor
10. The speed of every fifth car passing a police speed trap
3. 11. A survey of 500 students from a university with 2000 students
12. The annual salary for each employee at a company
In Exercises 17–20, identify the population and the sample.
17. A study of 33,043 infants in Italy was conducted to find a link
between a heart rhythm abnormality and sudden infant death
syndrome. (Source: New England Journal of Medicine)
18. A survey of 1023 households in the U.S. found that 65%
subscribe to cable television
19. A survey of 546 women found that more than 56% are the
primary investor in their household. (Adapted from: Roper Starch
Worldwide for Intuit)
20. A survey of 872 vacationers from the U.S. found that they
planned on spending at least $1800 for their next vacation
p. 107 Chapter Quiz #3-7
3. U.S. sporting goods sales (in billions of dollars) can be classified
in four areas: clothing (9.6), footwear (5.9), equipment (13.5), and
recreational transport (15.1). Display the data using (a) a pie chart
and (b) a Pareto chart. (Source: National Sporting Goods
Association)
a)
4. Weekly salaries (in dollars) for a sample of registered nurses are
listed.
774 446 1019 795 908 667 444 960
a) Find the mean, the median, and the mode of the salaries. Which
best
4. describes a typical salary?
b) Find the range, variance, and standard deviation of the data set.
Interpret
the results in the context of the real-life settingfrom a sample of
houses is $155,000 with a
standard deviation of $15,000. The data set has a bell-shaped
distribution.
Between what two prices do 95% of the houses fall?
6. Refer to the sample statistics of Exercise 5 and use z-scores to
determine
which, if any, of the following house prices is unusual
7. The number of wins for each Major League Baseball team in
2000 are listed.
(Source: Major League Baseball)
87 85 83 74 69 95 90 79 77 69 91 91 82 71 95
94 79 67 65 95 85 73 72 69 65 97 86 85 82 76
a) Find the quartiles of the data set.
65 65 67 69 69 69 71 72 73 74 76 77 79 79 82 82 83 85 85 85 86
87 90 91 91 94 95 95 95 97
3. The midpoint of a class is the sum of its lower and upper limits
4. The relative frequency of a class is the sample size divided by
the frequency of the class
19. Use a dot plot to display the data. The data represent the life
span (in days) of 40 houseflies.
20. Use a pie chart to display the data. The data represent the
number of Nobel Prize laureates by country during the years 1901–
1993
5. 38.
Japan’s estimated population for the year 2010 is given in the bar
graph. Make a frequency distribution for the data. Then use the
table to estimate the sample mean and the sample standard
deviation of the data set. (Source: U.S. Census Bureau,
International Data Base)
39.
The coefficient of variation CV describes the standard deviation as
a percent of the mean. Because it has no units, you can use the
coefficient of variation to compare data with different units
40.
(a) Use the shortcut formula to calculate the sample standard
deviation for the data set given in Exercise 19
(b) Compare your results to those obtained in Exercise
=======================
MTH 540 Week 2 Individual Assignment Problem Set
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1. The following data set represents the repair costs (in dollars) for
a random sample of 30 dishwashers. (Adapted from Consumer
Reports)
5. In a survey of 2000 adults from the U.S. age 65 and over, 1320
received a flu shot. (Adapted from The Centers for Disease Control
and Prevention)
6. 6. Refer to the data set in Exercise 1. Assume the population of
dishwasher repair costs is normally distributed
32. In Exercises 29–34, consider each claim. If a hypothesis test is
performed, how should you interpret a decision that (a) rejects the
null hypothesis? (b) fails to reject the null hypothesis?
37. A refrigerator manufacturer claims that the mean life of its
refrigerators is about 15 years. You are asked to test this claim.
How would you write the null hypothesis if
33. A tea drinker’s society estimates that the mean consumption of
tea by a person in the U.S. is more than 7 gallons per year. In a
sample of 100 people, you find that the mean consumption of tea is
7.8 gallons per year with a standard deviation of 2.67 gallons. At
α=0.07, can you support the society’s claim?
35.
The number of years it took a random sample of 32 former
smokers to quit permanently is listed. At α = 0.05 test the claim
that the mean time it takes smokers to quit smoking permanently is
15 years. (Adapted from The Gallup Organization)
42. A weight loss program claims that program participants have a
mean weight loss of at least 10 pounds after one month. You work
for a medical association and are asked to test this claim. A
random sample of 30 program participants and their weight losses
(in pounds) after one month is listed below. At α = 0.03, do you
have enough evidence to reject the program’s claim?
========================
MTH 540 Week 2 Learning Team Assignment
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Nielsen Media Research
Case Study 1
1. Rating Points Each rating point represents 1,022,000 households
or 1% of the households in the United States. Does a program with
a rating of 8.4 have twice the number of households as a program
with a rating of 4.2? Explain your reasoning.
2. Sampling Percent What percent of the total number of U.S.
households is used in the Nielsen sample?
3. Nominal Level of Measurement Which columns in the table
contain data at the nominal level?
4. Ordinal Level of Measurement Which columns in the table
contain data at the ordinal level? Describe two ways that the data
can be ordered.
5. Interval Level of Measurement Which column in the table
contains data at the interval level? How can these data be ordered?
What is the unit of measure for the difference of two entries in the
data set?
6. Ratio Level of Measurement Which three columns contain data
at the ratio level?
7. Share The column listed as “Share” gives the percent of
televisions in use at a given time. Does the Nielsen rating rank
shows by rating or by share? Explain your reasoning.
8. 8. Inferences What decisions (inferences) can be made based on
the Nielsen ratings?
Real Statistics Real Decisions
“You are a researcher for a professional research firm. Your firm
has won a contract on doing a study for an automobile industry
publication. The publication would like to get its readers'
(engineers, manufacturers, researchers and developers) thoughts on
the future of automobiles, such as what type of fuel they think will
be used in the future. The publication would like to get input from
those who work for automakers and from those who work for
automaker suppliers. The publication has given you their
readership database and the 20 questions they would like to ask
(two sample questions from a previous study are given at the
right). It is too expensive to contact all of the readers, so you need
to determine a way to contact a representative sample of the entire
readership population” (Farber & Larson, 2013, p. 28).
Exercises
1. How Would You Do It?
a. What sampling technique would you use to select the sample for
the study? Why?
b. Will the technique you chose in part (a) give you a sample that
is representative of the population?
c. Describe the method for collecting data.
d. Identify possible flaws or biases in your study.
2. Data Classification
a. What type of data do you expect to collect: qualitative,
quantitative, or both? Why?
b. What levels of measurement do you think the data in the study
will be? Why?
9. c. Will the data collected for the study represent a population or a
sample?
d. Will the numerical descriptions of the data be parameters or
statistics?
3. How They Did It
a. Describe some possible errors in collecting data by mailed
surveys.
b. Compare your method for collecting the data in Exercise 1 to
this method
=======================
MTH 540 Week 3 Individual Assignment
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Section 7.3 #23 and 37
23.
A microwave oven repairer says that the mean repair cost for
damaged microwave ovens is less than $100.You work for the
repairer and want to test this claim. You find that a random sample
of five microwave ovens has a mean repair cost of $75 and a
standard deviation of $12.50. At α = 0.01 do you have enough
evidence to support the repairer’s claim?
37.
10. In Exercises 37 and 38, decide whether you should use a normal
sampling distribution or a t-sampling distribution to perform the
hypothesis test. Justify your decision. Then use the distribution to
test the claim. Write a short paragraph about the results of the test
and what you can conclude about the claim.
A car company says that the mean gas mileage for its luxury sedan
is at least 21 miles per gallon (mpg).You believe the claim is
incorrect and find that a random sample of 5 cars has a mean gas
mileage of 19 mpg and a standard deviation of 4 mpg. Assume the
gas mileage of all of the company’s luxury sedans is normally
distributed. At α = 0.05, test the company’s claim.
Section 7.4 #10 and 12
In Exercises 9 –14, (a) write the claim mathematically and identify
H_0 and H_a, (b) find the critical values and identify the rejection
regions, (c) find the standardized test statistic, and (d) decide
whether to reject or fail to reject the null hypothesis. Then interpret
the decision in the context of the original claim.
10. A medical researcher estimates that no more than 55% of U.S.
adults eat breakfast every day. In a random sample of 250 U.S.
adults, 56.4% say that they eat breakfast every day. At α = 0.01, is
there enough evidence to reject the researcher’s claim?
12. An environmentalist claims that more than 50% of British
consumers want supermarkets to stop selling genetically modified
foods. You want to test this claim. You find that in a random
sample of 100 British consumers, 53% say that they want
supermarkets to stop selling genetically modified foods. At α =
0.10, can you support the environmentalist’s claim?
Section 7.5 #17 and 26
In Exercises 17–26, (a) write the claim mathematically and identify
H_0 and H_a (b) find the critical value(s) and identify the rejection
region(s), (c) use the x²-test to find the standardized test statistic,
and (d) decide whether to reject or fail to reject the null hypothesis.
11. Then interpret the decision in the context of the original claim.
Assume the populations are normally distributed.
17.
A large appliance company estimates that the variance of the life
of its appliances is 3. You work for a consumer advocacy group
and are asked to test this claim. You find that a random sample of
the lives of 27 of the company’s appliances has a variance of 2.8.
At α = 0.05, do you have enough evidence to reject the company’s
claim?
26.
An employment information service says that the standard
deviation of the annual salaries for public relations managers is at
least $14,500. The annual salaries for 18 randomly chosen public
relations managers are listed. At α = 0.10, can you reject the claim?
=====================
MTH 540 Week 3 Learning Team Assignment Problem Set
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Case Study Chapter 6
1. A loggerhead sea turtle is classified as a juvenile if its shell
length is less than 40 centimeters. How many of the turtles in the
sample were juveniles?
2. Use the sample to make a point estimate of the mean shell length
of all juvenile loggerhead sea turtles that drift from their hatching
site to the coast of Britain.
3. Find the standard deviation of the sample of juveniles.
12. 4. Use the sample to make an interval estimate of the mean shell
length of juvenile loggerhead sea turtles that drift from their
hatching site to the coast of Britain.
(a) Use a 90% confidence level.
(b) Use a 95% confidence level.
(c) Use a 99% confidence level.
5. How would your results have differed if you had used all the
turtles in the sample instead of just the juvenile turtles? Explain
your reasoning.
6. Complete the following table
Chapter 7 Case Study
1. Complete the hypothesis test for all adults (men and women) by
performing the
following steps. Use a level of significance of a = 0.05
2. If you lower the level of significance to α = 0.01, does your
decision change? Explain your reasoning.
3. Test the hypothesis that the mean temperature of men is 98.6°F.
What can you conclude at a level of significance of α = 0.01?
4. Test the hypothesis that the mean temperature of women is 98.6.
What can you conclude at a level of significance of a=0.01?
5. Use the sample of 130 temperatures to form a 99% confidence
interval for the mean body temperature of adult humans.
6. The conventional “normal” body temperature was established by
Carl Wunderlich over
13. 100 years ago. What, in Wunderlich's sampling procedure, do you
think might have led
=======================
MTH 540 Week 4 Individual Assignment Problem Set
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Chapter 10 Review Exercises #1-4
In Exercises 1 and 2, use a X² goodness-of-fit test to test the claim
about the population distribution. Interpret the decision in the
context of the original claim.
1.
A health care investigator wishes to test the following claim: Of all
doctor’s office visits in the United States, 25% are from new
patients, 25% are from old patients with a new problem, and the
remainder are old patients with a recurring problem. A random
sample of various doctors finds that 97 patients were new, 142
were old with a new problem, and 457 were old patients with a
recurring problem. Test the claim at α = 0.05.
2.
A legal researcher is studying the age distribution of juries by
comparing them to the overall age distribution of available jurors.
The researcher claims that the jury distribution is different from the
overall distribution; that is, there is a noticeable age bias in jury
selection in this area. The following table shows the number of
jurors at a county court in one year and the percent of persons
residing in that county, by age. Use the population distribution to
find the expected juror frequencies. Test the researcher’s claim at α
= 0.01.
14. 3.
The following table shows the highest level of education of people
in the United States by age category in a recent year. The numbers
listed are in thousands of persons. Use α = 0.10.
4.
The contingency table shows the results of a random sample of 480
individuals classified by gender and type of vehicle owned. Use α
= 0.05.
==========================
MTH 540 Week 4 Learning Team Assignment Problem Set
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Case Study Chapter 9
1. Using your intuition, classify the following (x, y) pairs as having
a weak correlation (0<r< 0.5) a moderate correlation or a (.5 <r <
0.8), strong correlation (.8<r<1.0)
2. Now, use a technology tool to find the correlation coefficient for
each pair in Exercise 1. Compare your results to those obtained by
intuition.
4. Use the results of Exercise 3 to predict the following.
(a) The neck circumference of a man whose weight is 180 pounds.
15. (b) The abdomen circumference of a man whose hip circumference
is 100 centimeters
5. Are there pairs of measurements that have stronger correlation
coefficients than 0.85? Use a technology tool and intuition to reach
a conclusion
Case Study Chapter 10
1. In 1999, how many people in the United States aged 16–24 died
as a result of a motor vehicle crash?
2. Assuming the variables region and age are independent, in
which region did the number of motor vehicle fatalities for the 16–
24 age group exceed the expected number of fatalities?
3. Assuming the variables region and age are independent, in
which region did the number of motor vehicle fatalities for the 25–
34 age group exceed the expected number of fatalities?
4. At α=0.05 perform a chi-square test to determine whether the
variables region and age are independent. What can you conclude?
5. Compare the distribution of the sample of motor vehicle
fatalities from the eastern United States with the national
distribution. What can you conclude?
6. Compare the distribution of the sample of motor vehicle
fatalities from the central United States with the national
distribution. What can you conclude?
7. Compare the distribution of the sample of motor vehicle
fatalities from the western United States with the national
distribution. What can you conclude?
16. 8. In addition to the variables used in this case study, what other
variables do you think are important considerations when studying
the distribution of motor vehicle fatalities?
==========================
MTH 540 Week 5 Individual Assignment Problem Set
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Chapter 9 Quiz #1-9
For Exercises 1–8, refer to the data in the following table. The
table lists the personal income and outlays (both in trillions of
dollars) for Americans for 11 recent years
1. Construct a scatter plot for the data. Do the data appear to have a
positive linear correlation, a negative linear correlation, or no
linear correlation? Explain
2. Calculate the correlation coefficient r. What can you conclude?
4. Find the equation of the regression line for the data. Include the
regression line in the scatter plot.
5. Use the regression line to predict the personal outlays when the
personal income is 5.3 trillion dollars.
6. Find the coefficient of determination and interpret the results.
7. Find the standard error of estimate s_e and interpret the results
17. 8. Construct a 95% prediction interval for personal outlays when
personal income is 6.4 trillion dollars. Interpret the results
9. The equation used to predict sunflower yield (in pounds) is ŷ =
1257 – 1.34x_1+
1.41x_2, where x_1 is the number of acres planted (in thousands)
and x_2 is the number of acres harvested (in thousands). Use the
regression equation to predict the y-values for the given values of
the independent variables listed below. Then determine which
variable has a greater influence on the value of y.
=====================
MTH 540 Week 5 Learning Team Assignment Hypothesis Testing and
Regression Analysis
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MTH 540 Week 5 Learning Team Assignment Hypothesis Testing
and Regression Analysis
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