Suppose we have two normal populations denoted A and B, and we want to compare their population variances by estimating the ratio: variance of population B divided by variance of population A.  We have an independent random sample of size 15 from population A and an independent random sample of size 9 from population B.  The sample variance for population B turns out to be 30 percent larger than that for population A.  What is the 99 percent confidence interval for the ratio:  population variance of population B divided by population variance of population A?  Use stattrek.org for finding the needed critical values.

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