The test statistic of z= - 3.28 is obtained when testing the claim that p = 1 / 4. a. Using a significance level of a = 0.05, find the critical value(s). b. Should we reject Ho or should we fail to reject Ho? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. . . . a. The critical value(s) is/are z = ect: ( (Round to two decimal places as needed. Use a comma to separate answers as needed.)