Use the t-distribution table to nd the critical value(s) for the indicated alternative hypotheses, level of signicance or, and sample sizes n1 and n2. Assume that the samples are independent, normal. and random. Answer parts (a) and (b). Hazp1), use \"One Tail, 0:\" column with a positive sign two-tailed (15). use \"Two Tails. 01' column with a negative and a positive sign. (a) Find the critical value assuming that the population variances are equal. Read the T Table when (M. = n1+ n2 -2 E] (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.) (b) Find the critical value assuming that the population variances are not equal. Read the TTable when d.f.= smaller of n1~1 or n2 -1 El (Type an integer or decimal rounded to three decimal places as needed. Use a comma to separate answers as needed.)