单选题

An analysis conducted a significance test to determine if the relationship between two variables was real or the result of chance．His null hypothesis is the that the population correlation coefficient is equal to zero and his alternative hypothesis is that the population correlation coefficient is different from zero．He developed the following information:

Value of the test statistic	2.8092
Critical value at the 0.05 significance level	1.96
Critical value at the 0.01 significance level	2.58

The analyst conducted a（）。

A、 one-tailed test and can reject-his null hypothesis．
B、 Two-tailed test and can reject his null hypothesis．
C、 One-tailed test and cannot reject his null hypothesis.

【正确答案】 B

【答案解析】

Because the alternative hypothesis is that the correlation is different from zero (either above or below zero), the analyst conducted a two-tailed test．Because the test statistic is greater than either of the critical values, the analyst can reject the null hypothesis.