What is the critical value (in a test about proportions) for a left-tailed test with α = 0.05 and n ≥ 30?

Question

What is the critical value (in a test about proportions) for a left-tailed test with α = 0.05 and n ≥ 30?

select one:

a. z = -1.96

b. z = -2.33

c. z = 2.58

d. z = -1.645

e. No Answer

Answer 1

You can find this on a TI-84

INVNORM

area = alpha = 0.05

mean = 0

sd = 1

alternatively look for area = 0.05 in a Z/area table and read off the corresponding Z score