Classify the hypothesis test as left-tailed, right-tailed, or two-tailed. At one school, the average amount of time that spend watching television each week is21.6hours.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 21.6hours.

a. Two-tailed

b. Right-tailed

c. Left-tailed