In the study described in Case Study 1.4, questionnaires were ...

[jayhills49]

In the study described in Case Study 1.4, questionnaires were sent to 100,000 women asking about love, sex and relationships. Only 4.5 of the women responded. This means that
 a. the margin of error for the survey was 4.5.
  b. a random sample was not contacted.
  c. women who felt strongly did not respond.
  d. nonresponse bias was likely to be a major problem.

Question 2

If a magazine sends a survey to a random sample of 10,000 of its subscribers but only 3000 of them return the survey, the sample results may not be representative of the population of subscribers because
 a. they used a self-selected sample.
  b. there is likely to be nonresponse bias.
  c. a volunteer sample was used.
  d. they used a random sample.

[Kedrick2014]

Answer to Question 1

D

Answer to Question 2

B

[jayhills49]

Excellent

[chereeb]

TYSM