Chapter 04
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WebQuizzing – Ch.04
Book ISBN-10 0538477490
Book ISBN-13 9780538477499
Author: Gerald Keller
Title: Statistics for Management and Economics
Ed: 9e
# Questions Submitted: 20 Multiple Choice
1. A marketing research firm selects a random sample of adults and asks them a list of questions
regarding their beverage preferences. What type of data collection is involved here?
A. An experiment.
B. A survey.
C. Direct observation.
D. None of these choices.
Analysis:
A. Incorrect. A survey is the type of data involved here.
B. Correct. A survey is the type of data involved here.
C. Incorrect. A survey is the type of data involved here.
D. Incorrect. A survey is the type of data involved here.
ANSWER: B Ref: Section 4.1
2. Which of the following statements is true regarding the design of a good survey?
A. The questions should be kept as short as possible.
B. A mixture of dichotomous, multiple-choice, and open-ended questions may be used.
C. Leading questions must be avoided.
D. All of these choices are true.
Analysis:
A. Incorrect. All of these choices are true.
B. Incorrect. All of these choices are true.
C. Incorrect. All of these choices are true.
D. Correct. All of these choices are true.
ANSWER: D Ref: Section 4.1
3. Which of the following must be avoided in designing a survey?
A. Dichotomous questions.
B. Leading questions.
C. Demographic questions.
D. All of these choices are true.
Analysis:
A. Incorrect. Leading questions must be avoided in designing a survey.
B. Correct. Leading questions must be avoided in designing a survey.
C. Incorrect. Leading questions must be avoided in designing a survey.
D. Incorrect. Leading questions must be avoided in designing a survey.
ANSWER: B Ref: Section 4.1
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4. Which method of data collection is involved when a researcher counts and records the
number of students wearing backpacks on campus in a given day?
A. An experiment.
B. A survey.
C. Direct observation.
D. None of these choices.
Analysis:
A. Incorrect. The method is direct observation.
B. Incorrect. The method is direct observation.
C. Correct. The method is direct observation.
D. Incorrect. The method is direct observation.
ANSWER: C Ref: Section 4.1
5. A researcher conducts a study where she divides subjects into two groups, gives each group a
certain treatment, and records their responses. What type of data collection is being used
here?
A. An experiment.
B. Direct observation.
C. A survey.
D. A census.
E. Analysis:
A. Correct. An experiment is the type of data collection used here.
B. Incorrect. An experiment is the type of data collection used here.
C. Incorrect. An experiment is the type of data collection used here.
D. Incorrect. An experiment is the type of data collection used here.
ANSWER: A Ref: Section 4.1
6. The personnel director at a large company studied the eating habits of the company’s
employees. The director watched and recorded whether each employee brought his/her own
lunch to work, ate at the company cafeteria, or went out to lunch. What method of data
collection was used here?
A. Direct observation.
B. An experiment.
C. A survey.
D. A personal interview.
Analysis:
A. Incorrect. Direct observation is the type of data collection used here.
B. Incorrect. Direct observation is the type of data collection used here.
C. Incorrect. Direct observation is the type of data collection used here.
D. Correct. Direct observation is the type of data collection used here.
ANSWER: A Ref: Section 4.1
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7. Which of the following data collection methods is not observational?
A. A personal interview.
B. A telephone interview.
C. A self-administered questionnaire.
D. An experiment.
Analysis:
A. Incorrect. An experiment is the type of data collection used here.
B. Incorrect. An experiment is the type of data collection used here.
C. Incorrect. An experiment is the type of data collection used here.
D. Correct. An experiment is the type of data collection used here.
ANSWER: D Ref: Section 4.1
8. The difference between a sample mean and the population mean is called:
A. nonresponse error.
B. selection bias.
C. sampling error.
D. nonsampling error.
Analysis:
A. Incorrect. A sampling error is the difference between a sample mean and the population mean.
B. Incorrect. A sampling error is the difference between a sample mean and the population mean.
C. Correct. A sampling error is the difference between a sample mean and the population mean.
D. Incorrect. A sampling error is the difference between a sample mean and the population mean.
ANSWER: C Ref: Section 4.4
9. The manager of the customer service division of a major consumer electronics company is
interested in determining whether the customers who have purchased a videocassette
recorder over the past 12 months are satisfied with their products. If there are 4 different
brands of videocassette recorders made by the company, the best sampling strategy would be
to use a:
A. simple random sample.
B. stratified random sample.
C. cluster sample.
D. self-selected sample.
Analysis:
A. Incorrect. Stratified random sample is the best sampling strategy.
B. Correct. Stratified random sample is the best sampling strategy.
C. Incorrect. Stratified random sample is the best sampling strategy.
D. Incorrect. Stratified random sample is the best sampling strategy.
ANSWER: B Ref: Section 4.3
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10. A pharmaceutical company interested in measuring how often physicians prescribe a certain
drug has selected a simple random sample from each of two groups: M.D. (Medical Doctors)
and D.O. (Osteopaths). What is this type of sampling called?
A. Simple random sampling.
B. Cluster sampling.
C. Stratified random sampling.
D. None of these choices.
Analysis:
A. Incorrect. This type of sampling is called stratified random sampling.
B. Incorrect. This type of sampling is called stratified random sampling.
C. Correct. This type of sampling is called stratified random sampling.
D. Incorrect. This type of sampling is called stratified random sampling.
ANSWER: C Ref: Section 4.3
11. When the population is divided into mutually exclusive sets, and then a simple random
sample is drawn from each set, this is called:
A. simple random sampling.
B. stratified random sampling.
C. cluster sampling.
D. selection bias.
Analysis:
A. Incorrect. This is called stratified random sampling.
B. Correct. This is called stratified random sampling.
C. Incorrect. This is called stratified random sampling.
D. Incorrect. This is called stratified random sampling.
ANSWER: B Ref: Section 4.3
12. When every possible sample with the same number of observations is equally likely to be
chosen, the result is called a:
A. simple random sample.
B. stratified random sample.
C. cluster sample.
D. biased sample.
Analysis:
A. Correct. The result is called a simple random sample.
B. Incorrect. The result is called a simple random sample.
C. Incorrect. The result is called a simple random sample.
D. Incorrect. The result is called a simple random sample.
ANSWER: A Ref: Section 4.3
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13. Which of the following types of samples is almost always biased?
A. Simple random samples.
B. Stratified random samples.
C. Cluster samples.
D. Self-selected samples.
Analysis:
A. Incorrect. Self-selected samples is almost always biased.
B. Incorrect. Self-selected samples is almost always biased.
C. Incorrect. Self-selected samples is almost always biased.
D. Correct. Self-selected samples is almost always biased.
ANSWER: D Ref: Section 4.3
14. Which of the following types of samples should not be used to make good statistical
inferences from a sample to a population?
A. Stratified random samples.
B. Self-selected samples.
C. Cluster samples.
D. All of these choices are true.
Analysis:
A. Incorrect. All of these choices are true.
B. Incorrect. All of these choices are true.
C. Incorrect. All of these choices are true.
D. Correct. All of these choices are true.
ANSWER: D Ref: Section 4.2
15. Which of the following is an example of a nonsampling error?
A. Some incorrect responses are recorded.
B. Responses are not obtained from all members of the sample.
C. Some members of the target population cannot possibly be selected for the sample.
D. All of these choices are true.
Analysis:
A. Incorrect. All of these choices are true.
B. Incorrect. All of these choices are true.
C. Incorrect. All of these choices are true.
D. Correct. All of these choices are true.
ANSWER: D Ref: Section 4.4
16. The Dean of Students from a large university mailed a survey to 500 students selected at
random. The sample was designed to include 125 students randomly selected from each of
the freshman, sophomore, junior, and senior classes on campus. What sampling method was
used?
A. Simple random sample
B. Systematic sample
C. Stratified random sample
D. Cluster sample
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Analysis:
A. Incorrect. Stratified random sample was the sampling method used.
B. Incorrect. Stratified random sample was the sampling method used.
C. Correct. Stratified random sample was the sampling method used.
D. Incorrect. Stratified random sample was the sampling method used.
ANSWER: C Ref: Section 4.3
17. Which of the following situations lends itself to cluster samples?
A. When it is difficult to develop a complete list of the population members.
B. When the population members are widely dispersed.
C. When selecting and collecting data from a simple random sample is too costly.
D. All of these choices are true.
Analysis:
A. Incorrect. All of these choices are true.
B. Incorrect. All of these choices are true.
C. Incorrect. All of these choices are true.
D. Correct. All of these choices are true.
ANSWER: D Ref: Section 4.3
18. To give away a door prize, the host of a dinner party put each person’s name into a hat,
mixed them up, and selected one name. What sampling method was used?
A. Simple random sample
B. Systematic sample
C. Stratified random sample
D. Cluster sample
Analysis:
A. Correct. Simple random sample was the sampling method used here.
B. Incorrect. Simple random sample was the sampling method used here.
C. Incorrect. Simple random sample was the sampling method used here.
D. Incorrect. Simple random sample was the sampling method used here.
ANSWER: A Ref: Section 4.3
19. Which of the following causes sampling error?
A. Taking a random sample from a population instead of studying the entire population.
B. Making a mistake in the process of collecting the data.
C. Nonresponse bias.
D. All of these choices are true.
Analysis:
A. Correct. Taking a random sample from a population instead of studying the entire population
causes sampling error.
B. Incorrect. Taking a random sample from a population instead of studying the entire population
causes sampling error.
C. Incorrect. Taking a random sample from a population instead of studying the entire population
causes sampling error.
D. Incorrect. Taking a random sample from a population instead of studying the entire
population causes sampling error.
ANSWER: A Ref: Section 4.4
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20. Which of the following describes selection bias?
A. A leading question is selected for inclusion in the survey.
B. Some members of the target population are excluded from possible selection for the
sample.
C. A person selected for the sample has a biased opinion about the survey.
D. All of these choices are true.
Analysis:
A. Incorrect. Some members of the target population are excluded from possible selection for the
sample describes selection bias.
B. Correct. Some members of the target population are excluded from possible selection for the
sample describes selection bias.
C. Incorrect. Some members of the target population are excluded from possible selection for the
sample describes selection bias.
D. Incorrect. Some members of the target population are excluded from possible selection for the
sample describes selection bias.
ANSWER: B Ref: Section 4.4