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Question: A recent study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wall Street Journal, May 5 , 2010). Suppose this study was based on a random sample of 50 teen drivers.

a. Construct a 99% confidence interval for the proportion of all teenagers that have used cell phones while driving.

b. What is the margin of error with 99% confidence?

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