A study by Stanford University researchers for the Office of National Drug Control Policy and the Department

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A study by Stanford University researchers for the Office of National Drug Control Policy and the Department of Health and Human Services concluded that 98% of the top rental films involve drugs, drinking, or smoking. Assume that this study is based on the top 400 rental films.
a. Use the results of this sample to estimate the proportion of all films that involve drugs, drinking, or smoking.
b. What is the 95% confidence interval?
c. Do you believe that the top 400 films represent a random sample? Explain.
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Statistical Reasoning for Everyday Life

ISBN: 978-0321817624

4th edition

Authors: Jeff Bennett, Bill Briggs, Mario F. Triola

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