The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes n1 - 15 and n1 = 17 are selected, and the sample means and sample variances are x1 = 8.73, s,2 - 0.35, x2 8.68, and s22 = 0.40, respectively. Assume that o,2 = 022 and that the data are drawn from a normal distribution. Construct a 95% confidence interval for the difference in mean rod diameter. Interpret this interval. Edit View Insert Format Tools Table 12pt v Paragraph v

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