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In the T Test for Independent Groups, the Unbiased Estimate

Question 18

Multiple Choice

In the t test for independent groups, the unbiased estimate of the population variance 2 is _________.

A) s 12 alone
B) s 22 alone
C) a weighted average of s 12 and s 22
D) ( ΣS ₁+ ΣS ₂) /( n ₁ + n ₂ - 2)
E) c and d

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