SOLUTION: At one school, the mean amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch

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Question 939175: At one school, the mean amount of time that tenth-graders spend watching television each week is 18.4 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.
Formulate the null and alternative hypotheses for the study described.
A.
Ho: µ = 18.4 hours H a : µ ¹ 18.4 hours
B.
Ho: µ = 18.4 hours H a : µ < 18.4 hours
C.
Ho: µ ³ 18.4 hours H a : µ < 18.4 hours
D.
Ho: µ = 18.4 hours H a : µ > 18.4 hours
Answer by ewatrrr(24785) About Me  (Show Source):
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B.
Ho: µ = 18.4 hours
Ha: µ < 18.4 hours