A random sample is selected from a normal population with a mean of m 5 40 and

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A random sample is selected from a normal population with a mean of m 5 40 and a standard deviation of s 5 10.

After a treatment is administered to the individuals in the sample, the sample mean is found to be M 5 46.

a. How large a sample is necessary for this sample mean to be statistically significant? Assume a twotailed test with a 5 .05.

b. If the sample mean were M 5 43, what sample size is needed to be significant for a two-tailed test with a 5 .05?

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Essentials Of Statistics For The Behavioral Sciences

ISBN: 9781337098120

9th Edition

Authors: Frederick J Gravetter, Larry B. Wallnau, Lori Ann B. Forzano

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Question Posted: Jul 19, 2024 04:04 PM

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A random sample is selected from a normal population with a mean of m 5 40 and

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Essentials Of Statistics For The Behavioral Sciences

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