Question 7.3

3. A committee on community relations in a college town plans to survey local businesses about the importance of students as customers. From the 10,000 businesses listed in the telephone book, the committee chooses 150 businesses at random. Of these, 72 return the questionnaire mailed by the committee. The sample is

  1. all 10,000 businesses in the college town.
  2. the 150 businesses chosen.
  3. the 72 businesses that returned the questionnaire.

3.

c