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# When Should We Jump into the Pooled Procedures?

APSTAT-WXJE3K

When should we used pooled procedures?

A

When we assume the variances of two populations are equal.

B

When we assume the means of two populations are equal.

C

Any time we complete a confidence interval or hypothesis test for a difference in two population proportions.

D

Any time we use a $z$-test for a population proportion.

E

Never.