When Figuring the Pooled Population Variance Estimate in a T

question 1

Multiple Choice

When figuring the pooled population variance estimate in a t test for independent means,

• A)the variance of at least one of the original populations must be known,as opposed to estimated,but the other can be estimated from sample scores.
• B)the variance of BOTH of the original populations must be known,as opposed to estimated.
• C)the estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants.
• D)the scores from both samples are combined to form a single sample,and the estimated variance is figured in the usual way using this combined sample.

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