Question

The Harris Poll asked a sample of smokers “Do you believe that smoking will shorten your life, or not?” Of the 1010 people in the sample, 848 said “yes.” a. Harris called residential telephone numbers at random in an attempt to contact an SRS of smokers. Based on what you know about national sample surveys, what is likely to be the biggest weakness in the survey? b. We will nonetheless act as if the people interviewed are an SRS of smokers. Give a 95% confidence interval of the percent of smokers who agree that smoking will probably shorten their lives.

          The Harris Poll asked a sample of smokers “Do you believe that
smoking will shorten your life, or not?” Of the 1010 people in the
sample, 848 said “yes.”
a. Harris called residential telephone numbers at random in an
attempt to contact an SRS of smokers. Based
on what you know about national sample surveys, what is likely
to be the biggest weakness in the
survey?
b. We will nonetheless act as if the people interviewed are an SRS
of smokers. Give a 95% confidence
interval of the percent of smokers who agree that smoking will
probably shorten their lives.

Added by Deborah B.

Question

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