Advanced Topic: a Psychologist Investigating Hearing Thresholds Knows That an Average

question 51

Essay

Advanced topic: A psychologist investigating hearing thresholds knows that an average participant gets a score of 42 with a standard deviation of 15 on a standard hearing test.The psychologist plans to add a distraction task to the standard test for 10 participants and evaluate the effect of the distraction at the .01 level.The psychologist believes that the distraction should result in a 12-point reduction in scores .During the planning process,the psychologist realizes that 10 participants may not be enough for adequate power and has asked a consultant to calculate the power for this experiment.
a.What is the current power of the planned study?
b.Sketch the distributions involved.
c.What are three ways to increase the power of this study?
d.What is the predicted effect size?
e.Explain these procedures to a person who understands hypothesis testing with means of samples,but who is not familiar with effect size or power.

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