The diameter of steel rods manufactured on two different extrusion machines is being investigated. two random samples of sizes n1 15 and n2 17 are selected, and the sample means and sample variances are s1 2 0.35, and s 2 2 0.40, respectively. assume that 2 1 2 2 and that the data are drawn from a normal distribution. (a) is there evidence to support the claim that the two machines produce rods with different mean diameters? use a p-value in arriving at this conclusion. (b) construct a 95% ci for the difference in mean rod diameter. interpret this interval

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it would be 6xy and -16xy.

is there any photos or whatever?