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Enter the lower boundary of the interval below

Enter the lower boundary of the interval below

MATLAB: An Introduction with Applications
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 238.6 and a sample standard deviation of 27.8. Assuming that the population of tread wear indexes is normally distributed, construct a 99% confidence interval estimate of the population mean tread wear index for tires produced by this manufacturer under this brand name. Enter the lower boundary of the interval below. Round to two decimal places. 227.24
Transcribed Image Text: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 238.6 and a sample standard deviation of 27.8. Assuming that the population of tread wear indexes is normally distributed, construct a 99% confidence interval estimate of the population mean tread wear index for tires produced by this manufacturer under this brand name. Enter the lower boundary of the interval below. Round to two decimal places. 227.24
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