A manufacturer of television sets claims that the maintenance expenditures
A manufacturer of television sets claims that the maintenance expenditures for its product will average no more than $110 during the first year following the expiration of the warranty. A consumer group has asked you to substantiate or discredit the claim. The results of a random sample of 50 owners of such television sets showed that the mean expenditure was $131.60 and the standard deviation was $42.46. At the 0.01 level of significance, should you conclude that the manufacturer’s claim is true or not likely to be true?
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