If we want to see if the mean of the items in population 1 is less than the mean of the items in population 2, the alternative hypothesis should be mu_1 - mu_2 < 0. As a result, the correct answer is c. alternate hypothesis should state mu_1 - mu_2 < 0.
In statistical hypothesis testing, one of the assertions available is the alternative hypothesis. A hypothesis test's primary goal is to demonstrate that, under the given conditions, there is sufficient evidence to support the plausibility of an alternate hypothesis rather than the test's exclusive assumption (null hypothesis). It is usually consistent with the research hypothesis because it is based on a review of the literature, previous studies, and so on.
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