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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