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Hypothesis Testing with the z-Test A standardized mood assessment has a u = 65 and a o = 15. Higher scores reflect a more positive mood state. A pop music producer, interested in how music affects peoples' mood, hires a research company to assess this relationship. As a part of the study, the research company obtains a random sample of n = 40 adults and administers the mood assessment while they are listening to soft piano music. The mean for the sample was M = 69 Using a two-tailed test and a = .05, use the four-step hypothesis testing procedure to test the music producer's hypothesis that music affects mood Step 1: Formulate Hypotheses Step 2: Indicate the Alpha Level and Determine Critical Values Step 3: Calculate Relevant Statistics Step 4; Make a Decision and Report the Results Calculate Cohen's d and, using the guidelines suggested previously, indicate the Size of the effect