【简答题】Liam works in Sydney. Last week he had 41 holiday, but he didn’t know 42 to go. He said to his friend Robert, “I 43 the hot weather here, but I can’t find a cool place in Australia. How will I spend m...
【简答题】In his last will, he listed his wife and children as the ____________. (benefit)
【单选题】设随机变量X与Y的相关系数为0.9,若Z=X-0.4,则Z与Y的相关系数为
【简答题】简述随机抽样与非随机抽样的含义及各自具体包含哪些抽样方法。
【简答题】设随机变量X和Y的相关系数为0.9,若Z=X-0.4,则Y与Z的相关系数为________.
【单选题】He is not easy-going, but his trust in his friends will last forever once _______.
【单选题】设随机变量 与 的相关系数为0.9,若 ,则 与 的相关系数为( )
【单选题】X、Y、Z三个变量中,X与Y的相关系数为0.3,X与Z的相关系数为-0.7。若其相关系数的假设检验结果均为P<0.05,则以下说法正确的是