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April 20, 2014

Homework Help: Statistics

Posted by Anonymous on Sunday, July 24, 2011 at 2:44pm.

the manufacturer of a certain brand of auto batteries claims the mean life of these batteries is 45 months. A consumer protection agency that wants to check this claim took a random sample of 36 such batteries and found the mean life for this sample is 43.75 months with a standard deviation of 4.5 months. Find the p-value for the test hypothesis with the alternative hypothesis that the mean life of these batteries is less than 45 months.
Would you reject the manufactures claim at a 5% significance level? Explain

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