问题
单项选择题
If the probability of a Type I error decreases, then the probability of:（）
A. incorrectly rejecting the null increases.
B. a Type Ⅱ error increases.
C. incorrectly accepting the null increases.
答案
参考答案：B
解析：
If P(Type Ⅰ error) decreases, then P (Type Ⅱ error) increases. A null hypothesis is never accepted. We can only fail to reject the null.