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Statistics 9 Online
OpenStudy (anonymous):

A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded 200" on the sidewall of the tire. A random sample of n=16 indicates a sample mean tread wear index of 192.6 and a sample standard deviation of 29.6. Assuming that the population of tread wear indexes is normally distributed, construct a 95% confidence interval estimate of the population mean tread wear index for tires produced by this manufacturer under this brand name.

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