THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A dependent random sample from two normally distributed populations gives the following results:
n = 20,
= 26.5,s₂ = 3.2
-The confidence interval for the difference between two population means that are normally distributed where the population variances are unknown but assumed to be equal rely on:

A) the Satterthwaite's approximation.
B) the pooled sample variance.
C) the estimated sample variance.
D) the average sample variance.