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Question
In which of the following modes of data collection is the response rate lowest?
Options:
A .  Personal interview
B .  Telephonic interview
C .  Mailing questionnaire
D .  Equal for all modes
Answer: Option C
:
C
The response rate is lowest for 'mailing questionnaire' mode because respondents may not complete the questionnaire partially or fully. It may get lost in the mail also.

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