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A new material is being tested for use in the manufacture of electrical conduit, to determine whether it will reduce the variance in crushing strength over the old material Crushing strengths are measured for a sample of size 17 of the old material and a sample of size 20 of the new material. It it is shown that the crushing strength with the new material has smaller variance, the new material will be used. Let o represent the population variance for the crushing strength of the old material and let a represent the population variance for the crushing strength of the new material. Describe the appropriate test. State the appropriate null and alternate hypotheses, describe the test statistic, and specify which table should be used to find the value. If relevant, state the number of degrees of freedom for the test statistic. Check all that are true Check All That Apply An Frest is appropriate The appropriate null and alternate hypotheses are Hoof 20 versus of a The test statistic is the ratio of/ of the two sample variances The Ftable should be used to find the value
The Ftable should be used to find the value Help Save & Exit There are 17 and 20 degrees of freedom A test is appropriate The appropriate null and alternate hypotheses are Hoof so versus Mor 5 > The test statistic is the ratio is of the two sample variances. The table should be used to find the value There are 16 and 19 degrees of freedom The appropriate null and alternate hypotheses are of a versus