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 
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 < 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
Answer: A
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A. 3 B. 2 C. 5 D. 4
Find the reciprocal of the number or algebraic fraction.
A. 5
B. 0
C. 
D. 1
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Is the following correspondence a function?DomainRange 
A. function B. not a function