Question: A sample of n = 40 is selected from a normal population with = 75 msec. and = 12, and a treatment is

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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