Brian Ci believes that the average return

问题单项选择题

Brian Ci believes that the average return on equity in the airline industry, μ, is less than 5 percent. What are the appropriate null (H₀) and alternative (H_a) hypotheses to test this belief（）

A. H₀:μ≥0.05 versus H_a:μ＜0.05.

B. H₀:μ＜0.05 versus H_a:μ＞0.05.

C. H₀:μ＞0.05 versus H_a:μ＜0.05.

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 he wishes to reject (in favor of the alternative). Note that this is a one-sided alternative because of the "less than" belief.