In a two-tail test for the population mean, the null hypothesis will be rejected at a level of significance if the value of the standardized test statistic z is such that: A)z z_a B)z - z_a C)- z_a z z_a D)| z | z _{a \ 2}

Question

In a two-tail test for the population mean, the null hypothesis will be rejected at a level of significance if the value of the standardized test statistic z is such that: A)z > z_a B)z - z_a C)- z_a z z_a D)| z | > z _{a \ 2}

Quizplus · Accepted Answer

In a two-tail test, the null hypothesis is rejected if the absolute value of the test statistic, |z|, is greater than the critical value, which is determined by the level of significance (α) divided by 2, because the critical region is in both tails of the distribution.

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