Question

What is the z-value for a two-sided test of hypothesis for a population mean when the probability of rejecting a true null hypothesis is equal to 0.005?

Select one: a. 2.330 b. 1.960 c. 2.810 d. None of the suggested answers are correct. e. 2.575

Answer 1

We have z test for two tailed with level of significance a = 0.005

Zcritical = Z_{​​​​​​a/2} = Z_{​​​​​​0.0025}

Using Z table

Zcritical = 2.810