问题如下：
Ann, a junior analyst, wants to decrease the probability of errors during a hypothesis testing. She improved the testing by increasing the sample size. Which of the following is correct?
选项：
A. Only the probability of Type I error will decrease.
B. Only the probability of Type II error will decrease .
C. The probability of both Type I error and Type II error will decrease.
解释：
C is correct.
All else equal, Ann can decrease the probability of both Type I error and Type II error through increasing sample size. As large sample size means the precision of the population parameter estimation is improved.
type I error和type II error的概率不是此消彼长么？