What are the critical values of the following alpha values a

What are the critical values of the following alpha values?

a. ? = .01, two-tailed test

b. ? = .005, one-tailed test

c. ? = .02, two-tailed test

d. ? = .025, one-tailed test

Solution

alpha = 0.01 two tail so z = 2.57

alpha = 0.005 one tail so z = 2.57

alpha = 0.02 two tailed so z = 2.33

alpha = 0.025 one tailed so z = 1.96