小編導(dǎo)讀：高頓網(wǎng)校精品題庫，包含歷年真題，模擬試題等題型，題題結(jié)合考試大綱貼近考試考點。堅持每天做題練習(xí)，一定可以提升備考效果，為贏取屬于自己的美好明天加油吧！馬上開始練習(xí) >>>
　　Which of the following statements are wrong?
　　I             Type I error occurs when the null hypothesis is not rejected when it is actually false.
　　II           Type II error occurs when the null hypothesis is rejected when it is actually true.
　　III          Type I error occurs when the alternate hypothesis is wrongly accepted.
　　IV         Minimizing the probability of Type I error maximizes the power of the test.
　　A.         I and II
　　B.         I and III
　　C.         II and IV
　　D.         I, II and IV
　　Answer: D
　　In hypothesis testing we accept the alternate hypothesis if the null hypothesis has been rejected. Type I error happens if the null hypothesis is rejected when it is actually true. Type II error happens if the null hypothesis is accepted when it is actually false. The power of the test is the probability of correctly rejecting the null hypothesis (when it is false), so minimizing Type II (not Type I) errors would maximize the power of the test.