Question

company put flyers on each of their customers’ doors asking them to call in and say whether or not they would use this new service. the service received 73 phone calls, 65 of which would use the service. which sampling method was used? a. sample b. voluntary response c. census d. random selection

Explanation:

Voluntary response sampling is when people self - select to respond (here, customers call in voluntarily). A census includes all members, random selection is random, and "sample" is not a sampling method. So the method is voluntary response.

Answer:

B. voluntary response