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Two kinds of threads are been compared for strength. Fifty pieces of each type of thread...

Two kinds of threads are been compared for strength. Fifty pieces of each type of thread are tested under similar conditions. Brand A has an average tensile strength of 79.72 kg with a standard deviation of 5.14 KG while Brand B has an average tensile strength of 86.89 with a standard deviation of 5.63. Construct a 90% confidence interval for the ratio of two variances.

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