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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 ( 370, 430 ). Assume that this result is based on a sample of size 25 .

1. What is the value of the sample mean?

2. What is the value of the sample standard deviation?

3. Construct the 99% confidence interval

4. If the confidence interval (373.9233 , 426.0767) is obtained from the same sample data, what is the degree of confidence?

Math   Statistics-And-Probability   
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