Estimate of the population mean tread wear index

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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=25 indicates a sample mean tread wear index of 194.2 and a sample standard deviation of 27.4.

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.

Reference no: EM132917890

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