# A sample of n = 40 is selected from a normal population with μ = 75 msec. and σ = 12, and a treatment is administered to the sample, The treatment is expected to increase scores by an average of 4 msec. a. If the treatment effect is evaluated with a two-tailed hypothesis test using α = .05, what is the power of the test? b. What is the power of the test if the researcher uses a one-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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Chapter 8, Problem 17P
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