Carlos is designing a video game, and he's concerned that one of the levels is too difficult. He will redesign the level if he has convincing evidence that it takes the average player longer than 45 minutes to complete the level.
He plans on recruiting players to play the level until they complete it, and he'll use their completion times to
perform a significance test.
Let u represent the average completion time for players of this level.
Which of the following is an appropriate set of hypotheses for this significance test?