6. Test H_o: m(pronounced as MU) 8 versus H_A: m > 8, at a(alpha)= 0.05 and 0.01, given n = 25, X(Xbar) = 8.07 and s = 0.16. Assume the sample is selected from a normally distributed population.

7. Test H_o: = 0.25 versus H_A: =\(not equal to sign)0.25 with p = 0.33 and n = 100 at alpha = 0.05 and 0.10.

8. Test at (alpha) =.05 the hypothesis that a majority (more than 50%) of students favor the plus/minus grading system at a university if in a random sample of 400 students, 216 favor the system?

9. Test whether the sample evidence indicates that the average time an employee stays with a company in their current positions is less than 3 years when a random sample of 64 employees yielded a mean of 2.765 years and s = 0.8. Use (alpha)= 0.01. Assume normal distribution.

Answered required as detailed as possible!!!