At One School,the Average Amount of Time That Tenth-Graders Spend

At one school,the average amount of time that tenth-graders spend watching television each week is 21.6 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 21.6 hours.

A) Upper-tailed
B) Two-sided
C) Lower-tailed

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