Based on a sample of 50 U.S. citizens, the American Film Institute found that a typical American
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Based on a sample of 50 U.S. citizens, the American Film Institute found that a typical American spent 78 hours watching movies last year. The standard deviation of this sample was 9 hours.
a. Develop a 95% confidence interval for the population mean number of hours spent watching movies last year.
b. How large a sample should be used to be 90% confident the sample mean is within 1.0 hour of the population mean?
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Related Book For
Statistical Techniques In Business And Economics
ISBN: 9781260239478
18th Edition
Authors: Douglas Lind, William Marchal, Samuel Wathen
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