Question: A researcher plans to conduct an experiment evaluating the effect of a treatment. A sample of n = 9 participants is selected and each person

A researcher plans to conduct an experiment evaluating the effect of a treatment. A sample of n = 9 participants is selected and each person receives the treatment before being tested on a standardized dexterity task. The treatment is expected to lower scores on the test by an average of 30 points. For the regular population, scores on the dexterity task form a normal with µ = 240 and s = 30.
a. If the researcher uses a two-tailed test with a = .05, what is the power of the hypothesis test?
b. Again assuming a two-tailed test with a = .05, what is the power of the hypothesis test if the sample size is increased to n = 25?

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a With no treatment effect the distribution of sample means is centered at m 240 wi... View full answer

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