在一个数据组中,已知是的两倍,是的倍,试求这组数据的相关系数

在一个数据组中,已知的两倍,倍,试求这组数据的相关系数.(精确到

答案


解析:

,设,则

,    , 故

相关题目

 The teacher came in ____ a book under his arm . A. by            
 The teacher came in ____ a book under his arm . A. by             B. with                    C. for              D. as  
如图所示的电路中,当开关S闭合,甲、乙两表是电压表时,
如图所示的电路中,当开关S闭合,甲、乙两表是电压表时,示数之比U甲:U乙=3:2;当开关S断开,甲、乙两表是电流表时,则两表的示数之比I甲:I乙
如图所示,在空间有一坐标系xoy,直线OP与x轴正方向的夹角
如图所示,在空间有一坐标系xoy,直线OP与x轴正方向的夹角为,第一象限内有两个方向都垂直纸面向外的匀强磁场区域Ⅰ和Ⅱ,直线OP是他们的边界,OP
He has always ______his daughters,training them hard to compete against each oth
He has always ______his daughters,training them hard to compete against each other.
(3分)某同学为了检验家中的一瓶补铁药(成分为FeS04)是否变质
(3分)某同学为了检验家中的一瓶补铁药(成分为FeS04)是否变质,设计了如下实验:将药片除去糖衣研细后,溶解过滤,取滤液分别加入两支试管中,再进
阅读下面的文章,完成l4~16题。(7分) 阅读杂谈     ①阅
阅读下面的文章,完成l4~16题。(7分) 阅读杂谈     ①阅读是人类特有的神圣权利,如今互联网阅读、手机阅读等阅读方式的出现,为我们创造了各
 一蜂王和一雄蜂交配产生F1代,在F1代雌雄个体交配产生的F2
 一蜂王和一雄蜂交配产生F1代,在F1代雌雄个体交配产生的F2代中,雄蜂的基因型共AB、Ab、aB、ab4种,雌蜂的基因型共AaBb、Aabb、aaBb、aabb四种,则亲本
He feels that his health ____ owing to ____ a long walk every other day. A.is
He feels that his health ____ owing to ____ a long walk every other day. A.is improving; taking                    B.has been improved; being taken C.improved; taken