Suppose we have taken independent, random samples of sizes nj = 7 and n2 = 7 from two normally distributed populations having means /1 and H2, and suppose we obtain X1 = 240, X2 = 210, s1 = 5, $2 = 6. Assuming equal variances calculate a 95 percent confidence interval for M1 - /2. Can we be 95 percent confident that /1 - M2 is greater than 20? (Round your answers to 3 decimal places.) The confidence interval = [ the entire interval is 20 Why we can use the equal variances procedure here? O s1 and s2 very close and n1 = n2 O s1 and s2 very close and n1 * n2