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A consumer organization collected data on two types of batteries, A and B. The summary statistics...

A consumer organization collected data on two types of batteries, A and B. The summary statistics for 12 observations of each type are x(bar)A=365.1 minutes and sA=14.3, and x(bar)B=342.1 minutes and sB=9.3.

a.) Is there evidence to support the claim that type A battery mean life exceeds that of type B? Assume that both populations are normally distributed but the variances are not equal. Assume α=0.1

b.] Test the hypothesis in part (a) using the corresponding confidence interval

Math   Statistics-And-Probability   
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