 # A random simple is selected from a normal population with a mean of μ = 100 and a standard deviation of σ = 20. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 96. 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 = 98, what sample size would be needed to be significant for a two-tailed test with α = .05? ### Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570 ### Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

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