Explanation:
In a one-tailed hypothesis test with a significance level of 0.05, the rejection region depends on the specific alternative hypothesis being tested.
If the alternative hypothesis is one-tailed and states a direction of effect (e.g., greater than or less than), the rejection region will be either in the upper or lower tail of the distribution, but not both.
For a one-tailed hypothesis test with a significance level of 0.05, the rejection region will be either the upper 5% of the distribution or the lower 5% of the distribution, depending on the direction of the alternative hypothesis.
So, the correct answer is:
A) the upper 5% of the distribution if the alternative hypothesis is stating a greater-than effect.
or
B) the lower 5% of the distribution if the alternative hypothesis is stating a less-than effect