问题
问答题 简答题
简述假设检验中双边检验与单边检验的区别。
答案
参考答案：
在检验虚无假设时，即可以选定抽样分布的一端作为否定域，也可以选择两端，否定域在一端称为单边检验，否定域在两端称为双边检验，选择哪一种，取决于研究假设的方向，如果选定的显著度相同，单边检验比双边检验更难否定虚无假设。
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简述假设检验中双边检验与单边检验的区别。
参考答案：
在检验虚无假设时，即可以选定抽样分布的一端作为否定域，也可以选择两端，否定域在一端称为单边检验，否定域在两端称为双边检验，选择哪一种，取决于研究假设的方向，如果选定的显著度相同，单边检验比双边检验更难否定虚无假设。
根据短文内容，从方框中选择适当的词，并用其正确形式填空，使短文完整、正确。（每个词只能用一次，有两个多余的词；共10分，每小题1分）
I've never been 小题1: for school,but yesterday I came very close. My alarm clock didn't go 小题2: and by the time I woke小题3:, my father had already gone into the bathroom and I had to 小题4: for him to come out. I had to really rush. I 小题5: a quick shower, had some breakfast, and then ran off to the bus stop. Unfortunately, by the 小题6: I got there, the bus had already left. I started 小题7:, but I knew I couldn't get to school 小题8: time. Luckily , my friend Tony and his dad came by in his dad's car and they gave me a 小题9:. When I got to school, the final bell was ringing. I only 小题10: it to my class. |