Classify the hypothesis test as two-tailed,left-tailed,or right-tailed.

At one school, the average amount of time that tenth-graders spend watching television each week is

20.8

hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased from the previous mean of

20.8

hours.