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Find the sample mean used to form the interval

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Reference no: EM132843635

A 95% confidence interval for the MEAN recovery time after a certain major surgery is (100, 130) days.

a) Find the sample mean used to form the interval.

b) Find the margin of error.

c) Assume that the population standard deviation is 40. Determine the sample size needed to create the confidence interval (110, 130) with the margin of error you found in part b.

Reference no: EM132843635

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