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  1. mathematics
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  3. two chemical companies can supply a raw material.

Two chemical companies can supply a raw material. The concentration of an element in this material...

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Statistics

Two chemical companies can supply a raw material. Theconcentration of an element in this material is important. A randomsample with 9 observations from company 1 yields a sample mean of12.6 and a sample standard deviation of 2.7, and another samplewith 11 observations from company 2 yields a sample mean of 14.5and a sample standard deviation of 5.5. Is there a sufficientevidence to conclude that the variance of company 1 is less thanvariance of company 2 at 5% significance level?

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