Consider the two-sample procedures interference about the population means. If the sizes of the two samples are equal and the distributions of the two populations have similar shapes, then, for a broad range of distributions, the sampling distribution of the two-sample t-statistics is well-approximately by the specified t-distributions for sample sizes as small as

a) n₁ = n_{2 =} 10

b) n₁ = n_{2 =} 5

c) n₁ = n_{2 =} 30

d) n₁ = n_{2 =} 15

e) n_{1 =} n_{2 = 35}