101. The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes n1 = 20 and n2 = 15 are selected. The sample means and sample variances are x1-bar = 8.68, s12 = 0.35, x2-bar = 8.74, and s22 = 0.40, respectively. Assume that the data are drawn from a normal distribution. To test whether the variances are equal or not, we use