Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. 3) a= 0.01 for a right-tailed test. 3) A) 12.33 B) +1.65 C) +2.33 D) +1.65 4) a = 0.05 for a left-tailed test. 4) A) -1.96 B) +1.96 C) +1.65 D) -1.65 5) a = 0.01 for a two-tailed test. 5) A) +2.33 B) +1.96 C) +2.58 D) +1.65