(a) Are the lives of these brands of batteries different? (b) Analyze the residuals from this experiment. (c) Construct a 95 percent confidence interval estimate on the mean life of battery brand 2. Construct a 99 per- cent confidence interval estimate on the mean differ- ence between the lives of battery brands 2 and 3. (d) Which brand would you select for use? If the manu- facturer will replace without charge any battery that fails in less than 85 weeks, what percentage would the company expect to replace?

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