Considering the situation described, we have that:
- The appropriate null hypotheses is
.
- The appropriate alternative hypotheses is
.
<h3>What are the hypotheses tested?</h3>
At the null hypotheses, it is tested if the mean has not been reduced, that is, it still is of 5.2 hours, hence:
.
At the alternative hypothesis, it is tested if the mean has been reduced, that is, it is now of less than 5.2 hours, hence:

More can be learned about hypotheses tests at brainly.com/question/26454209
Answer:
Sorry
Step-by-step explanation:
i dont know
felling sorry
Answer:
19%
Step-by-step explanation:
19/100. i don't think it is that simple, but i did the best i could
Answer:
200
Step-by-step explanation: