A doctor claims that the population gets, on average, more than 8.5 hours of sleep. A study was conducted on a sample of 27 individuals, and observed that the mean hours of sleep was 8.9, with a standard deviation of 0.7. Answer the following questions to test the doctor's claim using an

= 0.01 level of significance.

Which one is the claim:

a. Ha

b. Ho

(b) What is the criticalt-value(s)?

(c) What is the test static?

(d) Is the null hypothesis rejected?

(e) Is the claim supported?