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 if: Alpha=0.05 and the test is two-tailed testAssume that the data has a normal distribution and the number ofobservations is greater than fifty.   Find the critical z value usedto test a null hypothesis if:  = 0.05 and the test is right-tailed.