In a Two-Tail Test for the Population Mean, the Null $\alpha$

Multiple Choice

In a two-tail test for the population mean, the null hypothesis will be rejected at the $\alpha$ level of significance if the value of the standardised test statistic z is such that:

A) z > z $\alpha$ .
B) z < -z $\alpha$
.
C) -z $\alpha$ < z < z $\alpha$ .
D) |z| > z $\alpha$ / 2 .