StatTutor Lesson - Cautions about Sample Surveys

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      Question 1

      66

      Question 1.

      True or false: Bias is only possible in non-random samples

      A.
      B.

      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

      98

      Question 2.

      What is under-coverage bias?

      A.
      B.
      C.
      D.
      E.

      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.
      2

      Question 3

      152

      Question 3.

      What is non-response bias?

      A.
      B.
      C.
      D.
      E.

      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.
      2

      Question 4

      234

      Question 4.

      What is respondent bias?

      A.
      B.
      C.
      D.
      E.

      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.
      2

      Question 5

      284

      Question 5.

      What is interviewer bias?

      A.
      B.
      C.
      D.
      E.

      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.
      2

      Question 6

      362

      Question 6.

      What is question wording bias?

      A.
      B.
      C.
      D.
      E.

      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

      413

      Question 7.

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

      a. Under-coverage bias

      b. Non-response bias

      c. Respondent bias

      d. Interviewer bias

      e. 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.
      2

      Question 8

      419

      Question 8.

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

      a. Under-coverage bias

      b. Non-response bias

      c. Respondent bias

      d. Interviewer bias

      e. 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

      454

      Question 9.

      What type of bias is possible for a convenience sample of oranges from a truckload? Select all that apply.

      A.
      B.
      C.
      D.
      E.

      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.
      2