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6. Most individuals are aware 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 29 automobiles that were four years old showed a sample standard deviation for annual repair costs of $270 and a sample of 26 automobiles that were two years old showed a sample standard deviation for annual repair costs of $230. 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 0.01 level of significance, what is your conclusion? What is the p- value? Discuss the reasonableness of your findings.

6. Most individuals are aware 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 29 automobiles that were four years old showed a sample standard deviation for annual repair costs of $270 and a sample of 26 automobiles that were two years old showed a sample standard deviation for annual repair costs of $230. 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 0.01 level of significance, what is your conclusion? What is the p- value? Discuss the reasonableness of your findings.

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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6. Most individuals are aware 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 29 automobiles that were four years old showed a sample standard deviation for annual repair costs of $270 and a sample of 26 automobiles that were two years old showed a sample standard deviation for annual repair costs of $230. 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 0.01 level of significance, what is your conclusion? What is the p- value? Discuss the reasonableness of your findings.
Transcribed Image Text:6. Most individuals are aware 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 29 automobiles that were four years old showed a sample standard deviation for annual repair costs of $270 and a sample of 26 automobiles that were two years old showed a sample standard deviation for annual repair costs of $230. 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 0.01 level of significance, what is your conclusion? What is the p- value? Discuss the reasonableness of your findings.
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