A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded 150" on the sidewall of the tire. A random sample of n=23 indicates a sample mean tread wear index of 144.4 and a sample standard deviation of 28.5. Complete parts (a) through (c). 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. nothing≤μ≤nothing (Round to two decimal places as needed.)

A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded 150" on the sidewall of the tire. A random sample of n=23 indicates a sample mean...

A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded

150"

on the sidewall of the tire. A random sample of

n=23

indicates a sample mean tread wear index of

144.4

and a sample standard deviation of

28.5.

Complete parts (a) through (c).

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.

nothing≤μ≤nothing

(Round to two decimal places as needed.)

Jun 07, 2022