Statistical Inferences for the Variance

# Statistical Inferences for the Variance - tatistical...

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Unformatted text preview: tatistical Inferences for Variance Statistical Inferences for Variance Objectives: earn to compare variance of a sample with • Learn to compare variance of a sample with variance of a population • earn to compare variance of a sample with Learn to compare variance of a sample with variance of another sample • troduce chi- quared distribution Introduce chi squared distribution • Introduce F-distribution Comparing a Sample Variance with a Population Variance • If a manager were trying to make a process output less variable, they could take a sample from the changed process and compare it with known data from the old process. It can then be determined if the new process is significantly less variable than the old process. Comparing a Sample Variance • ull hypothesis is that the new variance is with a Population Variance Null hypothesis is that the new variance is equal to the old variance • Alternative hypothesis is that the new population variance is smaller than the old variance • One sided test Comparing a Sample Variance with...
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Statistical Inferences for the Variance - tatistical...

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