题目5单选题
设<img src="https://tihai-oss-cloud.itihey.com/img/e84517f805255fe6e45890a9348fe75f.png">是来自总体X~N(0,1)的样本,则( )不能成立A. <img src="https://tihai-oss-cloud.itihey.com/img/e84517f805255fe6e45890a9348fe75f.png">是相互独立的随机变量B. <img src="https://tihai-oss-cloud.itihey.com/img/20bc694bea1f5ca1bf020be3bd9774a4.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/e84517f805255fe6e45890a9348fe75f.png">的方差都等于1D. <img src="https://tihai-oss-cloud.itihey.com/img/d5660bbb4b90c465cb4d8e95c7a40b79.png">