A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded250"on the sidewall of the tire. A random sample ofn=25indicates a sample mean tread wear index of246.7and a sample standard deviation of26.6.Complete parts (a) through (c).a.Assuming that the population of tread wear indexes is normally distributed, construct a90%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.)

We have given that, Sample mean=246.7, Sample Standard deviation =26.6 , Sample size n=25 and…

Answered: A consumer organization wants to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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

250"

on the sidewall of the tire. A random sample of

n=25

indicates a sample mean tread wear index of

246.7

and a sample standard deviation of

26.6.

Complete parts (a) through (c).

a.	Assuming that the population of tread wear indexes is normally distributed, construct a 90% 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.)

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