Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
1. (4.7) The transportation department of a large city A sample survey
wants to estimate the proportion of residents who
would use a system of aerial gondolas to commute to
work. The gondolas would be part of the city's effort
to relieve traffic congestion. The department asked
a random sample of residents whether they would
use the gondolas. The residents could respond with
yes, no, or maybe. Which of the following is the best
description of the method for data collection used by
the department?
2. (4.7) A school principal wanted to investigate student A stratified random sam-
opinion about the food served in the school cafe- ple
teria. The principal selected at random samples of
50 first-year students, 50 second-year students, 50
third-year students, and 50 fourth-year students to
complete a questionnaire. Which of the following best
describes the principal's sampling plan?
3. (4.7) Publishers of a magazine wish to determine what Mail surveys to 1,000 sub-
proportion of the magazine's 50,000 subscribers are scribers randomly select-
pleased with their subscription. The publishers intend ed from all subscribers.
to mail a survey to 1,000 subscribers randomly se-
lected from those who have received the magazine
for 5 years or more. This introduces selection bias,
since long-subscribing customers are more likely to
be pleased with their subscription. Which of the fol-
lowing would best eliminate selection bias?
4. (4.7) Eighteen individuals who use a particular form The study was not com-
of social media were assigned a new user interface parative—only one treat-
to use when logging in to their accounts. After using ment was used.
, Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
the new user interface for a week, each individual
was asked to rate how easy or hard the new user
interface was to use on a scale from 1 (extremely easy)
to 9 (extremely hard). Which of the following correctly
identifies why this is not a well-designed experiment?
5. (4.7) A recent study examined 699 car accidents There is an association be-
in Toronto over a fourteen-month period. Records tween cell phone use and
of phone-service providers were used to determine accidents, but not neces-
whether the driver was using a cell phone during sarily a causal relation-
or immediately before the accident. Overall, the re- ship.
searchers found that drivers using cell phones were
4.3 times as likely to have an accident as drivers who
were not using cell phones. The result was statistically
significant. Which of the following can be concluded
from this study?
6. (4.7)A program exists to encourage more middle Randomly select 25 names
school students to major in math and science when from the female students
they go to college. The organizers of the program on the list and randomly
want to estimate the proportion of students who, af- select 25 names from the
ter completing the program, go on to major in math or male students on the list.
science in college. The organizers will select a sample
of students from a list of all students who completed
the program. Which of the following sampling meth-
ods describes a stratified random sample?
7. (4.7) As part of a demographic study, a college admin- Stratified random sample
istrator needed to survey a sample of students from
the college. From each major offered at the college,
the administrator randomly selected 5 percent of the
students with that major to participate in the survey.
, Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
Which of the following is the best description of the
type of sample selected by the administrator?
8. (4.7) A newspaper editor wants to investigate whether Select a random sample
residents of the city support a proposal to build a from each voting district
new high school football stadium. The editor hires a based on the proportion
polling firm to conduct a survey and requests that a of city residents in the dis-
sample of 500 residents be selected using a stratified trict so that a total of 500 is
sampling design based on voting districts within the obtained.
city. Which of the following methods will achieve the
desired sampling design?
9. (4.7)A survey was administered to parents of high It is a stratified random
school students in a certain state to see if the parents sample because parents
thought the students' academic needs were being were randomly selected
met. To select the sample, the parents were divided from each group.
into two groups— one group of parents who live in
cities with populations of more than 100,000 and the
other group of parents who live in cities with popula-
tions less than or equal to 100,000. A random sample
of 100 parents from each group was taken. Which
of the following statements about the sample of 200
parents is true?
10. (4.7) A researcher wanted to estimate the average A stratified random sam-
amount of money spent on extracurricular activities ple
per school in a certain region. The researcher random-
ly selected 20 public schools and 20 private schools in
the region to use for a sample. Which of the following
best describes the type of sample that was taken?
11. (4.7) A regional transportation authority is interested
in estimating the mean number of minutes working
, Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
adults in the region spend commuting to work on a To decrease the variability
typical day. A random sample of working adults will be in estimates of the mean
selected from each of three strata: urban, suburban, commuting time
and rural. Selected individuals will be asked the num-
ber of minutes they spend commuting to work on a
typical day. Why is stratification used in this situation?
12. (4.7) Which of the following does not describe a sam- Giving the survey to 30
pling method that has a potential source of voluntary students selected at ran-
response bias for the administration of a survey about dom from each of the
college athletics at a university? eight dorms on campus
13. (4.7) The student government at a high school wants Number the students in
to conduct a survey of student opinion. It wants to the official school roster.
begin with a simple random sample of 60 students. Use a table of random
Which of the following survey methods will produce a numbers to choose 60
simple random sample? students from this roster
for the survey.
14. (4.7) A city planner is investigating traffic congestion The investigation is an ob-
at a certain intersection. To collect data, a camera servational study because
will record the number of cars that pass through the treatments are not im-
intersection at different hours of the day and on dif- posed.
ferent days of the week. Which of the following best
describes the type of investigation being conducted
by the city planner?
15. (4.7) The buyer for an electronics store wants to esti- Cluster random sample
mate the proportion of defective wireless game con-
trollers in a shipment of 5,000 controllers from the
store's primary supplier. The shipment consists of 200
boxes each containing 25 controllers. The buyer num-
bers the boxes from 1 to 200 and randomly selects six
Study online at https://quizlet.com/_at0cyj
1. (4.7) The transportation department of a large city A sample survey
wants to estimate the proportion of residents who
would use a system of aerial gondolas to commute to
work. The gondolas would be part of the city's effort
to relieve traffic congestion. The department asked
a random sample of residents whether they would
use the gondolas. The residents could respond with
yes, no, or maybe. Which of the following is the best
description of the method for data collection used by
the department?
2. (4.7) A school principal wanted to investigate student A stratified random sam-
opinion about the food served in the school cafe- ple
teria. The principal selected at random samples of
50 first-year students, 50 second-year students, 50
third-year students, and 50 fourth-year students to
complete a questionnaire. Which of the following best
describes the principal's sampling plan?
3. (4.7) Publishers of a magazine wish to determine what Mail surveys to 1,000 sub-
proportion of the magazine's 50,000 subscribers are scribers randomly select-
pleased with their subscription. The publishers intend ed from all subscribers.
to mail a survey to 1,000 subscribers randomly se-
lected from those who have received the magazine
for 5 years or more. This introduces selection bias,
since long-subscribing customers are more likely to
be pleased with their subscription. Which of the fol-
lowing would best eliminate selection bias?
4. (4.7) Eighteen individuals who use a particular form The study was not com-
of social media were assigned a new user interface parative—only one treat-
to use when logging in to their accounts. After using ment was used.
, Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
the new user interface for a week, each individual
was asked to rate how easy or hard the new user
interface was to use on a scale from 1 (extremely easy)
to 9 (extremely hard). Which of the following correctly
identifies why this is not a well-designed experiment?
5. (4.7) A recent study examined 699 car accidents There is an association be-
in Toronto over a fourteen-month period. Records tween cell phone use and
of phone-service providers were used to determine accidents, but not neces-
whether the driver was using a cell phone during sarily a causal relation-
or immediately before the accident. Overall, the re- ship.
searchers found that drivers using cell phones were
4.3 times as likely to have an accident as drivers who
were not using cell phones. The result was statistically
significant. Which of the following can be concluded
from this study?
6. (4.7)A program exists to encourage more middle Randomly select 25 names
school students to major in math and science when from the female students
they go to college. The organizers of the program on the list and randomly
want to estimate the proportion of students who, af- select 25 names from the
ter completing the program, go on to major in math or male students on the list.
science in college. The organizers will select a sample
of students from a list of all students who completed
the program. Which of the following sampling meth-
ods describes a stratified random sample?
7. (4.7) As part of a demographic study, a college admin- Stratified random sample
istrator needed to survey a sample of students from
the college. From each major offered at the college,
the administrator randomly selected 5 percent of the
students with that major to participate in the survey.
, Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
Which of the following is the best description of the
type of sample selected by the administrator?
8. (4.7) A newspaper editor wants to investigate whether Select a random sample
residents of the city support a proposal to build a from each voting district
new high school football stadium. The editor hires a based on the proportion
polling firm to conduct a survey and requests that a of city residents in the dis-
sample of 500 residents be selected using a stratified trict so that a total of 500 is
sampling design based on voting districts within the obtained.
city. Which of the following methods will achieve the
desired sampling design?
9. (4.7)A survey was administered to parents of high It is a stratified random
school students in a certain state to see if the parents sample because parents
thought the students' academic needs were being were randomly selected
met. To select the sample, the parents were divided from each group.
into two groups— one group of parents who live in
cities with populations of more than 100,000 and the
other group of parents who live in cities with popula-
tions less than or equal to 100,000. A random sample
of 100 parents from each group was taken. Which
of the following statements about the sample of 200
parents is true?
10. (4.7) A researcher wanted to estimate the average A stratified random sam-
amount of money spent on extracurricular activities ple
per school in a certain region. The researcher random-
ly selected 20 public schools and 20 private schools in
the region to use for a sample. Which of the following
best describes the type of sample that was taken?
11. (4.7) A regional transportation authority is interested
in estimating the mean number of minutes working
, Stats study sets 4.7-6.6
Study online at https://quizlet.com/_at0cyj
adults in the region spend commuting to work on a To decrease the variability
typical day. A random sample of working adults will be in estimates of the mean
selected from each of three strata: urban, suburban, commuting time
and rural. Selected individuals will be asked the num-
ber of minutes they spend commuting to work on a
typical day. Why is stratification used in this situation?
12. (4.7) Which of the following does not describe a sam- Giving the survey to 30
pling method that has a potential source of voluntary students selected at ran-
response bias for the administration of a survey about dom from each of the
college athletics at a university? eight dorms on campus
13. (4.7) The student government at a high school wants Number the students in
to conduct a survey of student opinion. It wants to the official school roster.
begin with a simple random sample of 60 students. Use a table of random
Which of the following survey methods will produce a numbers to choose 60
simple random sample? students from this roster
for the survey.
14. (4.7) A city planner is investigating traffic congestion The investigation is an ob-
at a certain intersection. To collect data, a camera servational study because
will record the number of cars that pass through the treatments are not im-
intersection at different hours of the day and on dif- posed.
ferent days of the week. Which of the following best
describes the type of investigation being conducted
by the city planner?
15. (4.7) The buyer for an electronics store wants to esti- Cluster random sample
mate the proportion of defective wireless game con-
trollers in a shipment of 5,000 controllers from the
store's primary supplier. The shipment consists of 200
boxes each containing 25 controllers. The buyer num-
bers the boxes from 1 to 200 and randomly selects six
