Use the t-distribution table to find the critical value(s) for the indicated alternative hypotheses, level of significance $\alpha$, and sample sizes $n_1$ and $n_2$. Assume that the samples are independent, normal, and random. Answer parts (a) and (b).
$H_a: \mu_1 > \mu_2$, $\alpha = 0.10$, $n_1 = 6$, $n_2 = 8$
(a) Find the critical value(s) assuming that the population variances are equal.