Find the critical value z Subscript alpha divided by z2 that

Find the critical value z Subscript alpha divided by z/2 that corresponds to the given confidence level.

90%

za/2 = ????

Solution

As

alpha/2 = (1 - confidence level)/2

Then, as the c level is 90%,

alpha/2 = 0.05

Thus, using a table/technology,

z(alpha/2) = 1.644853627 [ANSWER]