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A 90 % confidence interval (a t interval) for the mean lives (in minutes) of Kodak...

A 90 % confidence interval (a t interval) for the mean lives (in minutes) of Kodak AA batteries is ( 480, 520 ). Assume that this result is based on a sample of size 25

a. value of sample standard deviation

b. 99% confidence interval

c. If the confidence interval (482.6156 ,517.3844) is obtained from the same sample data, what is the degree of confidence?

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