问题
单项选择题
Jo Su believes that there should be a negative relation between returns and systematic risk. She intends to collect data on returns and systematic risk to test this theory. What is the appropriate alternative hypothesis（）
A. Ha:ρ＜0.
B. Ha:ρ＞0.
C. Ha:ρ=0.
答案
参考答案：A
解析：
The alternative hypothesis is determined by the theory or the belief. The researcher specifies the null as the hypothesis that she wishes to reject (in favor of the alternative). The theory in this case is that the correlation is negative.