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MINDTAPSTATICSTICCHAPTER11.docx

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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 $171.59 and a sample of 23 automobiles 2 years old showed a sample standard deviation for annual repair costs of $118.5. Let 4 year old automobiles be represented by population 1. The data is located in the Microsoft Excel Online file below.

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