Introduction to Sampling Methods

Question 1

An automotive website would like to estimate the percentage of drivers who own their cars, rather than lease their cars. Which of these survey methods would not provide a convenience sample to estimate the percentage who own their cars?

Revolt · Accepted Answer

D: an online survey for sharing data about their cars

Question 2

A community group would like to raise funds to pay for improvements to the community swimming pool. The group’s leaders are considering a number of methods to assess community interest in raising funds. Which of the following uses convenience sampling?

Revolt · Accepted Answer

C: The group stands outside a shopping center and asks residents who enter if they support raising funds.

Question 3

A community is considering raising funds to pay for improvements to the community swimming pool. To measure the level of interest, community leaders went door-to-door in a few neighborhoods and interviewed residents. Of the 230 residents contacted, 157 support raising funds to pay for improvements. Which of the following represents the population in this setting?

Revolt · Accepted Answer

A: all residents of the community

Question 4

Researchers would like to assess the overall health of white pine trees in a state park. Which of the following methods for choosing the trees to assess would be considered a convenience sample?

Revolt · Accepted Answer

B: The 100 trees closest to a ranger station are assessed for damage.

Question 5

Researchers would like to assess the overall health of white pine trees in a state park. Using a computer program, the researchers selected 100 random points in the state park and assessed the trees closest to the selected points. Of the 100 trees selected, 24 showed damage to their lower limbs. Which of the following describes the sample in this setting?

Revolt · Accepted Answer

C: the 100 trees checked for damage

Question 6

To estimate the mean number of text messages sent by cell-phone users, a researcher chooses a location on a college campus in the city and surveys the first 50 people who walk past. These subjects are asked how many text messages they have sent in the past 24 hours. Is it likely that bias will be present in the sample?

Revolt · Accepted Answer

B: Because this is a convenience sample of college students, it is likely that bias is present and that the results will overestimate the mean number of text messages sent.

Question 7

A statistics student considered many methods for collecting data from adults to estimate support for lowering the voting age to 16 years old. Which of the following methods would be least likely to include sampling bias?

Revolt · Accepted Answer

A: a random sample of 500 adults in the state

Question 8

To attract business, a clothing store mails discount coupons to residents of a town. To estimate the proportion of the store’s shoppers who are using the coupons, the store manager selects a random sample of 100 customers who visit the store on a weekend. The manager finds that 38 of them are using the coupons mailed to their homes. Which of the following describes the sample in this setting?

Revolt · Accepted Answer

C: the 100 randomly selected shoppers

Question 9

An economist would like to estimate the proportion of young adults who have college debt. An online survey invites young adults to share information about their level of college debt. Which of the following describes the survey design and potential bias?

Revolt · Accepted Answer

A: This is voluntary response and is likely to overestimate the proportion of young adults with college debt.

Question 10

Researchers would like to assess the overall health of white pine trees in a state park. The park has a paved road that runs through the middle of the park. To select trees to assess for damage, the ranger parks at the side of the road and chooses 100 trees near the road to assess for damage. Which of the following statements best describes the bias that may arise from the results?

Revolt · Accepted Answer

D: Trees near the road may have more damage than trees away from it, so the results may overestimate the overall damage of the trees.

Introduction to Sampling Methods Answers

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