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A consumer organization wants to estimate the actual tread wear index of a brand name of...

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=20 indicates a sample mean tread wear index of 196.6. and a sample standard deviation of 29.7.

Complete parts​ (a)

.

 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.
Math   Statistics-And-Probability   
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