Stat 211 Handout 9 (Chapter 9): Inferences Based on Two Samples tests
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,
when both popn. distributions are normal and at least one sample
size is small where unknown
,
are assumed to be the same (
=
)
and degrees of freedom
,
is used to look up the critical values. Your textbook calls this pooled t test.
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, 
when both popn. distributions are normal and at least one sample 
,
are assumed to be the same (
is used to look up the critical values. Your textbook calls this pooled t test.