To Obtain Data in a Survey, a Mailed Questionnaire Has

To obtain data in a survey, a mailed questionnaire has been used.Would you advise the researcher to follow up some of those in the sample who failed to respond to the questionnaire?

A) Yes, a large sample will avoid bias.
B) Yes, the respondents may differ from non-respondents.
C) No, delayed returns would be of doubtful value.
D) No, a certain loss of respondents is expected.

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