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

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A random sample is selected from a normal population with a mean of µ = 40 and a standard deviation of σ = 10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 42.

a. How large a sample is necessary for this sample mean to be statistically significant? Assume a two-tailed test with α = .05.

b. If the sample mean were M = 41, what sample size is needed to be significant for a two-tailed test with α = .05?

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Statistics For The Behavioral Sciences

ISBN: 9781111830991

9th Edition

Authors: Frederick J Gravetter, Larry B. Wallnau

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Question Posted: Mar 21, 2018 06:24 AM

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

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a With a 2point treatment effect for the zscore to be greater than 196 the sta...View the full answer

Statistics For The Behavioral Sciences

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