4 78 Refer to Exercise 4 77 Describe the sampling distribution for the sample sum...
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4 78 Refer to Exercise 4 77 Describe the sampling distribution for the sample sum Ey Is it unlikely improbable that Ey would be more than 70 units away from 960 Explain 4 79 Psychomotor retardation scores for a particular group of manic depressive patients have approximately a normal distribution with a mean of 930 and a standard deviation of 130 A ran dom sample of 20 patients from the group was selected and their mean psychomotor retardation score was obtained a What is the probability that their mean score was between 900 and 960 b What is the probability that their mean score was greater than 960 C What is the 90th percentile of their mean scores
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