A Hypothesis Test Is to Be Performed $21.6$ Hours the Principal Introduces a Campaign to Encourage the Students

Multiple Choice

A hypothesis test is to be performed. State the null and alternative hypotheses.
-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.

A) Null hypothesis: mean time $= 21.6$ hours
Alternative hypothesis: mean time $\leq 21.6$ hours
B) Null hypothesis: mean time $> 21.6$ hours
Alternative hypothesis: mean time $< 21$ .6 hours
C) Null hypothesis: mean time $= 21.6$ hours
Alternative hypothesis: mean time $< 21.6$ hours
D) Null hypothesis: mean time $< 21$ . 6 hours
Alternative hypothesis: mean time $= 21.6$ hours