1. Test H0: 8 versus HA: > 8, given = 0.01, n = 25, = 8.13 and s = 0.3. Assume the sample is selected from a normally distributed population.
2. Test H0: π = 0.25 versus HA: π 0.25 with p = 0.33 and n = 100 at alpha = 0.05 and 0.10.
3. Test at α = 0.01 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 500 students, 285 favor the system?
4. When carrying out a large sample test of H0: 10 vs. Ha: > 10 by using a critical value approach, we reject H0 at level of significance when the calculated test statistic is:
A. Less than z
B. Less than – z
C. Greater than z
D. Greater than z/2
E. Less than the p value
5. If you live in California, the decision to buy earthquake insurance is an important one. A survey revealed that only 133 of 337 randomly selected residences in one California county were protected by earthquake insurance. Calculate the appropriate test statistic to test the hypothesis which leads to the alternate hypothesis that less than 40% of the residents are protected by earthquake insurance?
A. – 0.20