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

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.

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