Chapter 1. Cautions about Sample Surveys

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Stat Tutor
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Question 1

1:06

Question 1.1

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Incorrect. Non-response bias and response bias are both possible in random samples.
Correct. Non-response bias and response bias are both possible in random samples.
Incorrect. Try again.
2

Question 2

1:38

Question 1.2

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Incorrect. Under-coverage occurs when the listing of the population is incomplete with individuals who belong to the population left off the list.
Correct. Under-coverage occurs when the listing of the population is incomplete with individuals who belong to the population left off the list.
Incorrect. Try again.
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Question 3

2:32

Question 1.3

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Incorrect. Non-response refers to not getting a response from a sampled individual. This could be because they refuse to respond or the individual could not be contacted.
Correct. Non-response refers to not getting a response from a sampled individual. This could be because they refuse to respond or the individual could not be contacted.
Incorrect. Try again.
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Question 4

3:54

Question 1.4

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Incorrect. Respondent bias occurs whenever the respondent does not give correct answers to the questions. This bias could be due to lying, making up an answer because they don't know or forgot, misunderstanding the question, etc.
Correct. Respondent bias occurs whenever the respondent does not give correct answers to the questions. This bias could be due to lying, making up an answer because they don't know or forgot, misunderstanding the question, etc.
Incorrect. Try again.
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Question 5

4:44

Question 1.5

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Incorrect. Interviewer bias is a special kind of response bias. It occurs when the interviewer influences the answers given by the respondent.
Correct. Interviewer bias is a special kind of response bias. It occurs when the interviewer influences the answers given by the respondent.
Incorrect. Try again.
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Question 6

6:02

Question 1.6

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Incorrect. Question wording bias occurs when the wording of the question influences the respondent to give certain answers.
Correct. Question wording bias occurs when the wording of the question influences the respondent to give certain answers.
Incorrect. Try again.
2

Question 7

6:53

Question 1.7

What type of bias is possible for telephone surveys? Select all that apply.

wg8JNehuALfILP6Sa. Under-coverage bias

wg8JNehuALfILP6Sb. Non-response bias

wg8JNehuALfILP6Sc. Respondent bias

wg8JNehuALfILP6Sd. Interviewer bias

wg8JNehuALfILP6Se. Question wording bias

Incorrect. In telephone surveys, all of these biases are possible.
Correct. In telephone surveys, all of these biases are possible.
Incorrect. Try again.
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Question 8

6:59

Question 1.8

What type of bias is possible for mail-in surveys? Select all that apply.

wg8JNehuALfILP6Sa. Under-coverage bias

wg8JNehuALfILP6Sb. Non-response bias

wg8JNehuALfILP6Sc. Respondent bias

3hMJDRP6OS+3EJIbd. Interviewer bias

wg8JNehuALfILP6Se. Question wording bias

Incorrect. In a mail-in survey, interviewer bias is not possible because there is no interviewer. But non-response bias is particularly high for mail-in surveys. People just throw their surveys in the trash.
Correct. In a mail-in survey, interviewer bias is not possible because there is no interviewer. But non-response bias is particularly high for mail-in surveys. People just throw their surveys in the trash.
Incorrect. Try again.
2

Question 9

7:34

Question 1.9

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Incorrect. When sampling oranges from a truckload, people are not involved, so only under-coverage bias is possible. In particular, oranges at the bottom of the truck are less likely to be sampled than oranges on the top.
Correct. When sampling oranges from a truckload, people are not involved, so only under-coverage bias is possible. In particular, oranges at the bottom of the truck are less likely to be sampled than oranges on the top.
Incorrect. Try again.
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