Concerning inference on two independent population means, which of the following assumptions must be met for the pooled variance estimate to be appropriate?
A) Both and .
D) Both populations are normally distributed.

Question

Concerning inference on two independent population means, which of the following assumptions must be met for the pooled variance estimate to be appropriate?
A) Both and . 
D) Both populations are normally distributed.

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The Answer of Concerning inference on two independent population means, which of the following assumptions must be met for the pooled variance estimate to be appropriate?
A) Both and . 
D) Both populations are normally distributed.

Concerning Inference on Two Independent Population Means, Which of the Following