H a : 1 < 2 , = 0.05, n 1 = 7, n

H_a: μ₁ < μ₂, α = 0.05, n₁ = 7, n₂ = 11

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.