[单项选择]当样本例数相同时,计量资料的成组f检验与配对t检验相比,一般情况下为() A. 成组t检验效率高一些 B. 配对t检验效率高一些 C. 二者效率相等 D. 大样本时二者效率一致 E. 与两组样本均数的大小有关
参考答案:B
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第1题: [单项选择]Cindy: John, where are the cookies Don"t tell me you ate them all! John: Yes, I did. ______. A. I couldn"t bear it B. I couldn"t help it C. They were too good to eat D. They were good to eat 参考答案:B 答案解析:解析:四种选择项意思区别较大。I couldn"t bear it.意思为:我不能忍受它(不好吃);They were too good to eat.意思为:它们太好了,不能吃。I couldn"t help it.意思为:我忍不住吃了它。They were good to eat.它们太好吃了。B项为最佳答案,D项次之。其他选项意思错误。