or should we fail to reject Ho? 13. The test statistic of z = -0.75 is obtained when testing the claim that p < 1/3. 14. The test statistic of z = 2.00 is obtained when testing the claim that p > 0.25. 15. The test statistic of z = 1.80 is obtained when testing the claim that p 0.314. 16. The test statistic of z = -1.60 is obtained when testing the claim that p = 0.455. Finding Critical Values. In Exercises 17-20, refer to the information in the given exer- cise and use a 0.05 significance level for the following. a. Find the critical value(s). b. Should we reject Ho or should we fail to reject Ho? 17. Exercise 13 18. Exercise 14 = 19. Exercise 15 20. Exercise 16