For the following statements and arguments, choose which one of the following statements best describe the evidence:
-"We have interviewed thousands of customers this year and found that the vast majority who talked to us are very pleased with our service; few customers feel the need to switch to one of the 'maverick' phone companies. We're glad to reach out and touch so many!" (ad for local telephone company)
Conclusion: Few customers feel the need to switch to one of the 'maverick' phone companies.
A) The sample is not sufficient in size or is not given.
B) The sample is not random.
C) The sample is not representative (or is lacking in breadth).
D) The sample is sufficient, random, and representative.

Question

Quizplus · Accepted Answer

Given that the company interviewed thousands of their own customers and drew a conclusion about their own customers, the survey is sufficient and random. However, it is not representative, since some customers did not speak to them. It sounds as if the satisfied customers spoke up and the dissatisfied ones did not talk to the interviewers. (You may want to credit people who said the survey was not random, since we are not specifically told that all customers had an equal chance of being called.)

For the Following Statements and Arguments, Choose Which One of the Following