12. If we are interested in testing whether the mean of population 1 is smaller than the mean of population 2, the
(A) null hypothesis should state \(\mu_{1} - \mu_{2} < 0\)
(B) null hypothesis should state \(\mu_{1} - \mu_{2} > 0\)
(C) alternative hypothesis should state \(\mu_{1} - \mu_{2}\geq 0\)
(D) None of the other answers is correct.

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