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Testing the advertising claims of a tire manufacturer

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You work for a consumer watchdog publication and are testing the advertising claims of a tire manufacturer. The manufacturer claims that the life spans of the tire are normally distributed with a mean of 40,000 miles and a standard deviation of 4000 miles. You test 16 tires and get the following life spans. Complete parts A through C

47,704 41747 26,505 35,027 34,152 43,214 39,793 36,109

25,610 31,824 36,947 36,297 31,963 38,163, 38,596 46000

Mean=

standard deviation=

Reference no: EM131555256

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