Independent random samples of n₁ = 16 and n₂ = 13 observation were selected from two normal populations with equal variance:

Population (1): sample mean = 34.6 sample variance = 4.8

Population (2): sample mean = 32.2 sample variance = 5.9

Find a 99% confidence interval for ₁ - ₂

1 + (x1 - X2) Itsp n1 n2(n1 - 1)s12 + (n2 -1)$2 2 Sp = n1 + n2 - 2