Posted by **melissa** on Sunday, February 20, 2011 at 4:58am.

Five years ago, an automobile manufacturer started offering an extended warranty to buyers of its sport-utility vehicle.Â Â The extended warranty covered defects occurring after the initial three-year warranty expired.Â Â Of the 10,000 people who bought the sport-utility vehicle in the first year of the program, 15% purchased the extended warranty.Â Â In the Warranty Department, you have recently received data on a random sample of 200 of the cars sold in the first year that the extended warranty was available. For this sample, the average extended-warranty expenditure per car for the one-year period after the initial warranty elapsed was $350., with a standard deviation of $100.

a.Â Â What is a 95 percent confidence interval for the mean one-year extended-warranty expenditure per automobile?

b.Â Â At its introduction, the extended warranty was priced at $224 per year per automobile.Â Â Compute a 95 percent confidence interval for the one-year profitability of the extended warranty.

c.Â Â How large a sample would the Warranty Department require if it wanted its 95 percent confidence interval for the mean warranty expenditure to be no more than+_$5

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**Writeacher**, Sunday, February 20, 2011 at 7:32am
What kind of HELP do you need? You need to be specific when asking questions here.

If all you do is post your entire assignment, **with no evidence of thinking on your part**, nothing will happen since no one here will do your work for you. But if you are specific about what you don't understand about the assignment or exactly what help you need, someone might be able to assist you.

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