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A radio station sent a letter in the mail to 1000 randomly chosen residents within its broadcast area. The letter contained one dollar and a survey. The survey asked recipients to track their radio habits over a week. The survey was to be filled out and sent back in to the radio station. Identify a problem with the study.
A) Some of the sample data are missing
C) The data are based on reported results
D) The correlation between the variables implies causality

Respuesta :

The problem is that the data are based on reported results, answer C.

This is a problem because when someone self-reports information it is not always accurate.  In some instances, those who self-report are not always honest when filling out survey information.