A sample of n = 40 is selected from a normal population with = 75 msec.
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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 points.
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?
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Related Book For
Statistics For The Behavioral Sciences
ISBN: 9781111830991
9th Edition
Authors: Frederick J Gravetter, Larry B. Wallnau
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