se the t-distribution table to find the critical value(s) for the indicated alternative hypotheses, level of significance , and sample sizes n1

and n2.

Assume that the samples are independent, normal, and random. Answer parts (a) and (b).

Ha: 1<2, a=0.025, n1=13, n2=11

Find the critical value(s) assuming that the population variances are equal.

Find the critical value(s) assuming that the population variances are not equal.