The average lifetime of a car tire is 20,000 km with a standard deviation of 4,500 km. A random sample of 100 tires is taken for quality control inspection. 1) What is the mean of the sample mean? 2) Compute the standard error of the sample mean? 3) Is the sampling distribution of this sample mean approximately normal? Justify your answer. 4) What sample size of car tire is required to provide a 0.95 probability that the average lifetime in the sample will be less than 20,600 km?
The average lifetime of a car tire is 20,000 km with a standard deviation of 4,500 km. A random sample of 100 tires is taken for quality control inspection. 1) What is the mean of the sample mean? 2) Compute the standard error of the sample mean? 3) Is the sampling distribution of this sample mean approximately normal? Justify your answer. 4) What sample size of car tire is required to provide a 0.95 probability that the average lifetime in the sample will be less than 20,600 km?
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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The average lifetime of a car tire is 20,000 km with a standard deviation of 4,500 km. A random sample of 100 tires is taken for quality control inspection.
1) What is the
2) Compute the standard error of the sample mean?
3) Is the sampling distribution of this sample mean approximately normal? Justify your answer.
4) What
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