22. A researcher is evaluating the influence of a treatment using a sample selected from a normally...

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22. A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of 80 and a standard deviation of 20. The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with .05.

a. Compute the power of the test if the researcher uses a sample of n 16 individuals. (See Example 8.6.)

b. Compute the power of the test if the researcher uses a sample of n 25 individuals.

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