单选题
编号：2690459
1. Which of the following statements about hypothesis testing is least accurate?
- A.The power of test = 1-P(Type II error).
- B.If the computed z-statistic = -2 and the critical z-value = -1.96,the null hypothesis is rejected.
- C.The calculated z-statistic for a test of a sample mean when the population variance is known is:
