Question

The sign on the shoe store door said: "Ninety-nine percent of our clients are satisfied customers!" They based this on the comment cards left by customers. What could have happened to make this sample biased?
a. The store clerks only gave comment cards to customers who were smiling when they left the store.
b. Not enough comment cards were returned.
c. The cards were only given to people who bought two pairs of shoes.
d. Not enough comment cards were given out.

Answer 1

Answer:

Option A

Explanation:

A biased sample is the one in which only that part of a lot is chosen as sample which works  with the decision desired. As for in the given case, the store chooses to receive a review from the customers who are happy.

A smiling face confirms that the person is happy with the store service.

Thus, when we provide them the comment card maximum feasibility is that they shall write back a positive comment about the store service.

In this manner if comment card is not provided to unhappy customers, the opinion formed is a biased opinion.

Final Answer

Only customers with happy faces are given an option to fill the comment card.