Question

A pharmacy wants to survey its customers to find out which brand of toothpaste they prefer.

Which survey methods are likely to be biased?

Answer 1

Answer: Those customers who buy toothpaste with a coupon are selected, and the toothpaste brand they purchased is recorded.

A survey is sent to the customers who are on the pharmacy’s frequent buyer list.

Explanation:

I DID THE TEST

Answer 2

One hundred people from the pharmacy’s customer list are selected at random, called on the phone, and asked.
or
Those customers who buy toothpaste with a coupon are selected, and the toothpaste brand they purchased is recorded.