【单选题】两个样本均数比较作t检验,其他条件不变,犯第II类错误的概率最小的是
【简答题】Both Tom and Jack ____my friends. (is, are)
【判断题】重复抽样抽需要的样本单位数目总是比不重复抽样的多。( )
【判断题】重复重样需要的样本单位数目总是比不重复抽样的多。
【简答题】Friends come to visit us in the evening, they spend their time telling us they are in a hurry and looking at their watches . It isn’t that our friends are all very busy, it is just that when we haven’...
【单选题】Both you and he _____ my friends. [ ]
【简答题】My father was in the navy, which meant that my mother was married to both my father and the sea. As was often the case, we had to pack our belongings into boxes and those we had grown to love. We woul...
【单选题】My friends and I are interested in drawing, but _____ of us is good at it. [ ]
【单选题】I will make friends with _______shares both my joys and sorrows.