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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Statistical Techniques In Business And Economics

ISBN: 9781260239478

18th Edition

Authors: Douglas Lind, William Marchal, Samuel Wathen

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Question Posted: Dec 14, 2020 12:23 AM

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Statistical Techniques In Business And Economics

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