What is the population? For each of the following sampling situations, identify the population as exactly as possible. That is, say what kind of individuals the population consists of and say exactly which individuals fall in the population. If the information given is not sufficient, complete the description of the population in a reasonable way.

(a) A sociologist is interested in determining the extent to which teens are selfmotivated.

She selects a sample of four high schools in a large city and interviews all tenth-graders in each of the schools.

(b) The lecturer in a large introductory mathematics course is concerned about the accuracy with which multiple-choice tests are graded by her teaching assistants.

After the most recent test, she selects a sample of the exams and regrades them.

(c) The host of a local radio talk show wonders if people who are actively religious are happier than those who are not. The station receives calls from 48 listeners who voice their opinions.

AppendixLO1