题目
A pollster wants to find out if citizens are satisfied with the city council.Which procedure would be most appropriate for obtaining a statistically unbiased sample?
Choose one answer.
a.placing an advertisement in the local newspaper asking for mail-in responses
b.surveying people whose names have been randomly chosen from the telephone book
c.mailing a questionnaire to people whose names have been chosen randomly from a list of customers of the municipal utility company
d.interviewing people at a popular local shopping centre
Choose one answer.
a.placing an advertisement in the local newspaper asking for mail-in responses
b.surveying people whose names have been randomly chosen from the telephone book
c.mailing a questionnaire to people whose names have been chosen randomly from a list of customers of the municipal utility company
d.interviewing people at a popular local shopping centre
提问时间：2021-04-01
答案
应该选B.
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