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A state s public health department randomly contacted 30 hospitals in the state to find...

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A state s public health department randomly contacted 30 hospitals in the state to find the number of cases of flu reported in the previous week The mean was 83 and the standard deviation was 24 They then randomly contacted 60 hospitals in the state and found the same mean and standard deviation The 90 confidence interval for the sample size of 30 is The 90 confidence interval for a sample size of 60 is m When n Confidence Level as a percent 90 95 99 When n 30 75 79 to 90 21 When n 60 77 90 to 88 10 When n 30 74 41 to 91 59 When n 60 73 93 to 89 07 30 77 90 to 88 10 When n 60 75 79 to 90 21 When n 30 73 93 to 89 07 When n 60 74 41 to 91 59 z value 1 645 1 960 2 576

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