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A tire manufacturer has been producing tires with an average life expectancy of 26,000 miles. Now ...

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A tire manufacturer has been producing tires with an average life expectancy of 26,000 miles. Now ...

A tire manufacturer has been producing tires with an average life expectancy of 26,000 miles. Now the company is advertising that its new tires' life expectancy has increased. In order to test the legitimacy of the advertising campaign, an independent testing agency tested a sample of 6 of their tires and has provided the following data.

Life Expectancy
(In Thousands of Miles)
28
27
25
28
29
25

a.	Determine the mean and the standard deviation.
b.	At 99% confidence using the critical value approach, test to determine whether or not the tire company is using legitimate advertising. Assume the population is normally distributed.
c.	Repeat the test using the p-value approach.

Textbook

Essentials of Statistics for Business and Economics

Edition: 7^th

Authors: Anderson, Sweeney, Williams, Camm, Cochran

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jasm

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More solutions for this book are available here

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kwmusick Author

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Thanks

gma_of_7

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You make an excellent tutor!

shimyshiguy

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Smart ... Thanks!

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