Consider again the data set of the breaking strengths of n = 20 bundles of wool fibers

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Consider again the data set of the breaking strengths of n = 20 bundles of wool fibers and m = 25 bundles of synthetic fibers in Problem 9.3.7. Construct 90%, 95%, and 997r confidence intervals for the ratio of the variances of the breaking strengths of the two types of liber.
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