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G nsc.instructure.com C Quizzes PSY 210 003 - Intro to Statistical Methods - Fa20 - Zoom Psych 210: Exam 2 + 4. Scores on a measure of self-efficacy (the belief that you can solve problems in your life) form a normal distribution with a mean of u = 60 and a standard deviation of o = 15. Find the sample means that create the outer limits of the middle 95% of the sampling distribution with samples of n = 30. (Use your Unit Normal Table) (4 pts) 95% M = M= 5. Dr. Marshall just conducted a two-tailed hypothesis test in which she rejected the null (party time!). She found that listening to music while taking a statistics exam increases grades. But, when you looked at her hypothesis test you noticed that she set a = .05 and used z = 1.65 and z = -1.65 as her critical regions. Her treatment group had z = 1.813. a. Name the type of error Dr. Marshall made and what went wrong. (2 pts) b. What does this mean about her finding? (2 pts)