Historical data indicate that the standard deviation of a process is 6.3. A recent sample of size

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a. 28 produced a variance of 66.2. Test to determine if the variance has increased using a significance level of 0.05.

b. 8 produced a variance of 9.02. Test to determine if the variance has decreased using a significance level of 0.025. Use the test statistic approach.

c. 18 produced a variance of 62.9. Test to determine if the variance has changed using a significance level of 0.10.

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Business Statistics A Decision Making Approach

ISBN: 9780136121015

8th Edition

Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry, Kent D. Smith

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Question Posted: Sep 21, 2024 10:03 AM

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Historical data indicate that the standard deviation of a process is 6.3. A recent sample of size

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Business Statistics A Decision Making Approach

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