Question: When testing hypotheses about two population means where 1 and 2 are unknown and no assumption is made about the equality of 1 and 2,

When testing hypotheses about two population means where 1 and 2 are unknown and no assumption is made about the equality of 1 and 2, we use

A Normal distribution.

B Student t distribution with df = bigger of n1 - 1 and n2 - 1.

C Student t distribution with df = smaller of n1 - 1 and n2 - 1.

D Student t distribution with df = n1 + n2 - 2.

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