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The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random...

The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of size n1 = 15 and n2 = 23 are selected, and the sample means and sample variances are X1 = 9, sample variance 1 = 0.9, X2 = 8, sample variance 2 = 1.3, respectively. Assume variance1=variance2 and that the data are drawn from a normal distribution.In order to test the hypothesis calculate t0

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