Question

the owner of a professional basketball team claims that the mean attendance at games is over 30,000 and therefore the team needs a new arena. determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed

Answer 1

The choice of one-tailed or two-tailed tests follows the logic of the hypothesis that is being tested! The one-tailed test, if appropriate, will be more powerful.