Answered: Most individuals are aware of the fact…

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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Most individuals are aware of the fact that the average annual repair cost for an automobile
depends on the age of the automobile. a researcher is interested in finding out whether the
variance of the annual repair costs also increases with the age of the automobile. a sample
of 26 automobiles 4 years old showed a sample standard deviation for annual repair costs
of $170 and a sample of 25 automobiles 2 years old showed a sample standard deviation
for annual repair costs of $100.
a. state the null and alternative versions of the research hypothesis that the variance in
annual repair costs is larger for the older automobiles.
b. at a .01 level of significance, what is your conclusion? what is the p-value? Discuss
the reasonableness of your findings.

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