Sample Questions and answers
for Term Test2
Week 4
1. What sampling technique is being used in this scenario? Voters are selected at random from an
alphabetical list of all registered voters.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
d) Systematic sampling
2. What sampling technique is being used in this scenario? Voters are selected by choosing at
random several of the city's zip codes and selecting all the voters from those selected zip codes.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
d) Systematic sampling
3. What sampling technique is being used in this scenario? Several pieces of fruit from each tree in
an orchard are selected.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
d) Systematic sampling
For questions 4 - 10
An insurance industry research foundation wants to study the quality of care given to all patients at risk
for heart disease in the United States. Since not all those at risk seek treatment, the foundation
randomly selects 3,500 claims only from among those at-risk patients who were actually treated for
chest pain. The foundation obtains this sample in several stages. First, the foundation identifies 5 large
companies that represent a broad cross-section of patients, chooses 2 of the 5 at random, and gains
access to the claims of all the companies' patients. The two companies' claims are classified (depending
on their origin) to 7 geographical regions (California, Florida, Great Lakes, Midwest, Northeast, Southern,
and Southwest), and within each region, 5 counties are selected that represent a continuum spanning
rural, suburban, and urban populations. (In total, then, patients from 35 counties are included).
Within each county (and for each company), claims of 25 male and 25 female patients treated for chest
pain are randomly selected for the study, for a total of 3,500 patients.
4. The population is
a) a diverse group of US patients treated for chest pain
b) All US patients at risk for heart disease
c) A subset of 3,500 from a diverse group of US patients treated for chest pain
,Sample Questions and answers
for Term Test2
5. The sampling frame is:
a) a diverse group of US patients treated for chest pain
b) All US patients at risk for heart disease
c) A subset of 3,500 from a diverse group of US patients treated for chest pain
6. The sample is:
a) a diverse group of US patients treated for chest pain
b) All US patients at risk for heart disease
c) A subset of 3,500 from a diverse group of US patients treated for chest pain
For each stage in the multistage sampling plan of this study, identify the sampling technique that was
used:
7. The research foundation identifies 5 large companies that represent a broad cross-section of
patients, chooses 2 of the 5 at random, and gains access to the claims of all the companies'
patients.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
8. The 2 companies' claims are classified (depending on their origin) according to 7 geographical
regions, and within each region, the sampling continues.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
9. From each region, 5 representative counties are selected. (In total, all the claims originating from
35 counties are examined.)
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
10. Within each county (and for each company), claims of 25 male and 25 female patients are
randomly selected.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
11. When conducting a survey, it is important to use a random sample:
a) To get a significant result
b) To avoid bias and to get a representative sample
c) So that we can make casual conclusions
d) To ensure truthful answers to the survey’s questions
e) None of the above
,Sample Questions and answers
for Term Test2
12. In order to obtain a sample of undergraduate students in the United States, a simple random
sample of 10 states is selected. From each of the selected states, 10 colleges or universities are
chosen at random. Finally, from each of these 100 colleges or universities, a simple random
sample of 20 undergraduate students is selected. Thus, the final sample consists of 2,000
undergraduates.
a) Simple random sampling
b) Stratified sampling
c) Multistage sampling
d) Convenience sampling
e) None of the above
The next three questions refer to the following information (#13-15)
The faculty senate at a large university wanted to know what proportion of the students thought foreign
language classes should be required for everyone. The statistics department offered to cooperate in
conducting a survey, and a simple random sample of 500 students was selected from all the students
enrolled in statistics classes. A survey form was sent by email to these 500 students.
13. In this case, the population of interest is:
a) All the students at the university.
b) All the students enrolled in a statistics class.
c) The 500 students who got the email survey.
d) The students who responded to the email survey.
e) All the students who think that foreign language classes should be required for everyone.
14. The sampling frame is:
a) All the students at the university.
b) All the students enrolled in a statistics class.
c) The 500 students who got the email survey.
d) The students who responded to the email survey.
e) All the students who think that foreign language classes should be required for everyone.
15. Which of the following is true about this study?
a) Since the sample is random, it is representative of the population of interest
b) Even though the sample is random, it is not representative of the population of interest
16. Ross Times, the student newspaper of Ross College, printed a "What do you think?" column
feature asking: "Do you think that the college is doing enough to provide student parking?"
Anyone could mail in a response or use the paper's Web site to respond. In all, 126 answers were
received.
This is an example of:
a) A voluntary response sample
b) A multistage sample
c) A simple random sample
d) A convenience sample
e) The placebo effect
, Sample Questions and answers
for Term Test2
17. Which of the following is an example of stratified sampling?
for Term Test2
Week 4
1. What sampling technique is being used in this scenario? Voters are selected at random from an
alphabetical list of all registered voters.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
d) Systematic sampling
2. What sampling technique is being used in this scenario? Voters are selected by choosing at
random several of the city's zip codes and selecting all the voters from those selected zip codes.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
d) Systematic sampling
3. What sampling technique is being used in this scenario? Several pieces of fruit from each tree in
an orchard are selected.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
d) Systematic sampling
For questions 4 - 10
An insurance industry research foundation wants to study the quality of care given to all patients at risk
for heart disease in the United States. Since not all those at risk seek treatment, the foundation
randomly selects 3,500 claims only from among those at-risk patients who were actually treated for
chest pain. The foundation obtains this sample in several stages. First, the foundation identifies 5 large
companies that represent a broad cross-section of patients, chooses 2 of the 5 at random, and gains
access to the claims of all the companies' patients. The two companies' claims are classified (depending
on their origin) to 7 geographical regions (California, Florida, Great Lakes, Midwest, Northeast, Southern,
and Southwest), and within each region, 5 counties are selected that represent a continuum spanning
rural, suburban, and urban populations. (In total, then, patients from 35 counties are included).
Within each county (and for each company), claims of 25 male and 25 female patients treated for chest
pain are randomly selected for the study, for a total of 3,500 patients.
4. The population is
a) a diverse group of US patients treated for chest pain
b) All US patients at risk for heart disease
c) A subset of 3,500 from a diverse group of US patients treated for chest pain
,Sample Questions and answers
for Term Test2
5. The sampling frame is:
a) a diverse group of US patients treated for chest pain
b) All US patients at risk for heart disease
c) A subset of 3,500 from a diverse group of US patients treated for chest pain
6. The sample is:
a) a diverse group of US patients treated for chest pain
b) All US patients at risk for heart disease
c) A subset of 3,500 from a diverse group of US patients treated for chest pain
For each stage in the multistage sampling plan of this study, identify the sampling technique that was
used:
7. The research foundation identifies 5 large companies that represent a broad cross-section of
patients, chooses 2 of the 5 at random, and gains access to the claims of all the companies'
patients.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
8. The 2 companies' claims are classified (depending on their origin) according to 7 geographical
regions, and within each region, the sampling continues.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
9. From each region, 5 representative counties are selected. (In total, all the claims originating from
35 counties are examined.)
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
10. Within each county (and for each company), claims of 25 male and 25 female patients are
randomly selected.
a) Cluster sampling
b) Simple random sampling
c) Stratified sampling
11. When conducting a survey, it is important to use a random sample:
a) To get a significant result
b) To avoid bias and to get a representative sample
c) So that we can make casual conclusions
d) To ensure truthful answers to the survey’s questions
e) None of the above
,Sample Questions and answers
for Term Test2
12. In order to obtain a sample of undergraduate students in the United States, a simple random
sample of 10 states is selected. From each of the selected states, 10 colleges or universities are
chosen at random. Finally, from each of these 100 colleges or universities, a simple random
sample of 20 undergraduate students is selected. Thus, the final sample consists of 2,000
undergraduates.
a) Simple random sampling
b) Stratified sampling
c) Multistage sampling
d) Convenience sampling
e) None of the above
The next three questions refer to the following information (#13-15)
The faculty senate at a large university wanted to know what proportion of the students thought foreign
language classes should be required for everyone. The statistics department offered to cooperate in
conducting a survey, and a simple random sample of 500 students was selected from all the students
enrolled in statistics classes. A survey form was sent by email to these 500 students.
13. In this case, the population of interest is:
a) All the students at the university.
b) All the students enrolled in a statistics class.
c) The 500 students who got the email survey.
d) The students who responded to the email survey.
e) All the students who think that foreign language classes should be required for everyone.
14. The sampling frame is:
a) All the students at the university.
b) All the students enrolled in a statistics class.
c) The 500 students who got the email survey.
d) The students who responded to the email survey.
e) All the students who think that foreign language classes should be required for everyone.
15. Which of the following is true about this study?
a) Since the sample is random, it is representative of the population of interest
b) Even though the sample is random, it is not representative of the population of interest
16. Ross Times, the student newspaper of Ross College, printed a "What do you think?" column
feature asking: "Do you think that the college is doing enough to provide student parking?"
Anyone could mail in a response or use the paper's Web site to respond. In all, 126 answers were
received.
This is an example of:
a) A voluntary response sample
b) A multistage sample
c) A simple random sample
d) A convenience sample
e) The placebo effect
, Sample Questions and answers
for Term Test2
17. Which of the following is an example of stratified sampling?
