Given a sample of those who did not respond to a mailed questionnaire, the main purpose for interviewing the sample is to
A) increase the size of the sample.
B) attempt to change the results that the investigator did not like.
C) discover which items were unclear to the subjects.
D) determine whether non-respondents differ from respondents.
E) determine what the non-respondents think about the questionnaire.

Question

Quizplus · Accepted Answer

The main purpose of interviewing the sample of non-respondents is to determine whether they differ from respondents. This can help identify potential biases in the study and improve the generalizability of the findings. Increasing the sample size or attempting to change the results are not valid reasons for conducting the interviews. While discovering which items were unclear or understanding the non-respondents' thoughts on the questionnaire may be useful, the primary purpose is to compare non-respondents to respondents.

Given a Sample of Those Who Did Not Respond to a Mailed