题目：
An analyst conducted a significance test to determine if the relationship between two variables was real or the result of chance. His null hypothesis is 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:
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. two-tailed test and cannot reject his null hypothesis.
答案：
参考答案：B
解析：
[分析]： 由于备择假设为总体相关系数不等于零，亦即总体相关系数小于零或大于零，因而该分析师所进行的检验为双边检验。进一步地，由于检验统计量的数值(2.80)高于本题题干所提供的基于不同显著水平的关键值，因而该分析师应当拒绝原假设。也就是说，基于0.05的显著水平或0.01的显著水平，原假设不成立。 [考点] 假设检验的基本概念；检验统计量的计算
