Question: Suppose that you want to know the opinions of American secondary school teachers about establishing a national test for high school graduation. You obtain a

Suppose that you want to know the opinions of American secondary school teachers about establishing a national test for high school graduation. You obtain a list of the members of the National Education Association (the largest teachers' union) and mail a questionnaire to 3000 teachers chosen at random from this list. In all, 823 teachers return the questionnaire. Identify the relevant population. Do you believe there is a good possibility of non-sampling error? Why or why not?

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