In testing the difference between two population means using two independent samples, the population standard deviations are assumed to be known and the calculated test statistic equals 2.56. If the test is two-tail and 5% level of significance has been specified, the conclusion should be to:
A) reject the null hypothesis
B) not to reject the null hypothesis
C) repeat using a one-tail test
D) choose two other independent samples
E) none of these

Question

Quizplus · Accepted Answer

Since the calculated test statistic, 2.56, exceeds the critical value of 1.96 at the 5% level of significance for a two-tailed test, we reject the null hypothesis and conclude that there is a significant difference between the two population means.

In Testing the Difference Between Two Population Means Using Two