For a two-tail test,the null hypothesis will be rejected at the 0.05 level of significance if the value of the standardized test statistic z is:
A) smaller than 1.96 or greater than -1.96
B) greater than -1.96 or smaller than 1.96
C) smaller than -1.96 or greater than 1.96
D) greater than 1.645 or less than -1.645

Question

Quizplus · Accepted Answer

For a two-tail test with a significance level of 0.05, the critical values are +/- 1.96. Therefore, if the standardized test statistic z is smaller than -1.96 or greater than +1.96, we reject the null hypothesis. This corresponds to choice C.

For a Two-Tail Test,the Null Hypothesis Will Be Rejected at the 0.05