10. A sample of n = 4 scores has a mean of M = 75. Find the z-score for this sample: a. If it was obtained from a population with u = 80 %3D %3D and o = 10. %3D b. If it was obtained from a population with u = 80 %3D and o = 20. c. If it was obtained from a population with p. = 80 and a = 40 %3D

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