At One School,the Average Amount of Time That $\text { tenth-graders }$

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

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

Correct Answer:

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