题型:改错题 下列各处均有一处错误,请指出并改正。1. Jim is waiting the train. 2. Don’t read under the sun. 3. Look ! Some people are runing for trains. 4. Lily is in a bus trip now. 5. Let's look a ballet this evening. 查看答案
题型:单项选择题 A1型题 在假设检验时,本应是双侧检验而误用单侧检验水准,当拒绝H0时,将出现()。A.第一类误差增大B.第二类误差增大C.第一类误差减小D.第二类误差减小E.两类误差都增大 查看答案