A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American

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A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs 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 videos and DVDs 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: 978-0078020520

16th edition

Authors: Douglas Lind, William Marchal

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Question Posted: Dec 10, 2014 07:48 AM

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Statistical Techniques in Business and Economics

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