a. Using the given sample data, generate a 95% confidence interval for the difference between the mean lifetimes of brand 1 and brand 2 batteries. Based on this confidence interval, which brand should the buyer purchase?

b. Using the given sample data, generate a 99% confidence interval for the difference in the mean lifetimes of brand 1 and brand 2 batteries. Based on this interval, which brand should the buyer purchase?

c. How can your analysis in parts A and B be related to hypothesis testing?

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## This question was asked on Apr 24, 2010 and answered on Apr 25, 2010.

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