3. A simple random sample of 60 items resulted in a sample mean of 80. The population...

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3. A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is σ 15.

a. Compute the 95% confidence interval for the population mean.

b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean.

c. What is the effect of a larger sample size on the interval estimate?

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Essentials Of Statistics For Business And Economics

ISBN: 9780324568608

5th Edition

Authors: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams

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Question Posted: Nov 06, 2024 06:00 AM

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3. A simple random sample of 60 items resulted in a sample mean of 80. The population...

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Essentials Of Statistics For Business And Economics

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