The following results are for independent random samples taken from two populations. Sample 1 Sample 2 n1 = 20 n2 = 30 x1 = 22.7 x2 = 20.1 s1 = 2.4 s2 = 4.2 (a) What is the point estimate of the difference between the two population means? (Use x1 − x2.)   (b) What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.)

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A: Two samples, each with n = 5 scores, have a pooled variance of s 2 p = 40.