(Answered) A mood questionnaire has been established so that the

Economics

A mood questionnaire has been established so that the scores form a normal distribution with μ = 50 and σ = 15. A psychologist would like to use this test to examine how the environment affects mood. A sample of N = 25 individuals is obtained, and the individuals are given the mood test in a darkly painted, dimly lit room with plain metal desks and no windows. The average score for the sample is = 43. a. Do the sample data provide sufficient evidence to conclude that the environment has a significant effect on mood? Use a z Test at the α = .05 level of significance.

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