H a : 1 > 2 , = 0.05, n 1 = 13, n 2 = 8 Use Table 5 in Appendix

H_a: μ₁ > μ₂, α = 0.05, n₁ = 13, n₂ = 8

Use Table 5 in Appendix B to find the critical value(s) for the alternative hypothesis, level of significance a, and sample sizes n₁ and n₂. Assume that the samples are random and independent, the populations are normally distributed, and that the population variances are

(a) Equal

(b) Not equal.