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

Question

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 .

Quizplus · Accepted Answer

In a two-tail test, the null hypothesis is rejected if the absolute value of the test statistic is greater than the critical value, which is determined by $\alpha/2$ in each tail. Thus, |z| > z $\alpha/2$.

In a Two-Tail Test for the Population Mean, the Null α\alphaα

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