Question: The formula for the test statistic for the difference between two population means when the population variances are known has the format: Multiple choice question.

The formula for the test statistic for the difference between two population means when the population variances are known has the format: Multiple choice question. z = (x1x2)(12)21n1 22n2 . z = (x1x2) (12)21n1 22n2 . z = (x1x2)(12)21n122n2

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