Before opening a new dealership, an auto manufacturer wants to gather informatio

Question

Before opening a new dealership, an auto manufacturer wants to gather information about car ownership and driving habits of the local residents. The marketing manager of the company randomly selects 1000 households from all households in the area and mails a questionnaire to them. Of the 1000 surveys mailed, she receives 80 back. What is the problem with how the information is gathered?

A) To get a random sample, surveys would have to be mailed to every household.

B)The only responses were from people who chose to send the survey back.

C) The 1000 surveys were not sent to randomly selected households.

D) Only residents from the local area were polled.

Explanation / Answer

There is non-response bias .

hence option B) is correct

The only responses were from people who chose to send the survey back.

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