 # 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 distribution with μ = 240 and σ = 30. a. If the researcher uses a two-tailed test with α – .05, what is the power of the hypothesis test? b. Again assuming a two-tailed test with α – .05, what is the power of the hypothesis test if the sample size is increased to n = 25? ### 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 16P
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