Calculate a 95 confidence interval for the differ ence of th

Calculate a 95% confidence interval for the differ.. ence of the mean tensile strengths of the two rubl,e compounds. State your assumptions. 7.2 - 14. Let S and S be the respective variances of two independent random samples of sizes n and m from N( ) and N( ). Use the fact that F = has an F distribution, with parameters r1 = m - 1 andr2 = n - 1,to rewrite P(c