[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fGSbWXhZ-93g5xnbqL38GQtcJl1woEoYDrpvpN_vX4WU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2023-10-18 00:43:23",100430007,[8,9,10,11],"r=1","r=0","r=+0.98","r=-0.01",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},32,"8c1e342b4e0d5429c374cc26acf9a8f4","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb7852e7464107c52103a0cda7f15cb48.jpg","心理统计学","73b85ba22c014c7b9e993597bbe4e019","相关系数-统计","从X推测Y或从Y推测X,在下列哪些情况下推测是没有误差的?()",[21,33,43,52,61,70,79,88,97,102],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2023-10-18 00:43:21",100429988,[26,27,28,29],"0.52","0.62","0.70","0.72","有300名考生,期中和期末成绩的相关系数为0.62,两次考试成绩平均分数均为80分,如给所有考生的期中成绩各加8分,加分后两次成绩的相关系数是()","v1",0,{"answer":34,"createTime":35,"id":36,"options":37,"question":42,"source":31,"type":32},[],"2023-10-18 00:43:22",100429990,[38,39,40,41],"1.38","0.69","0.38","0.75","有两列正态变量x,y,其中Sx=4,Sy=2,Sx-y=3,求此两列变量的积差相关相关系数()",{"answer":44,"createTime":35,"id":45,"options":46,"question":51,"source":31,"type":32},[],100429992,[47,48,49,50],"相关程度很低","不存在任何相关","不存在线性相关关系","存在非线性相关关系","当积差相关系数r=0时,对两个变量之间关系的最佳解释是()",{"answer":53,"createTime":35,"id":54,"options":55,"question":60,"source":31,"type":32},[],100429993,[56,57,58,59],"如果另外再随机调查50名乡镇居民,他们为孩子购买课外读物的花费与老师对其孩子总体评价之间的相关系数会非常接近0.53","用城市居民为孩子购买课外读物的花费预测老师对其孩子总体评价的准确率为53%","城市居民为孩子购买课外读物的花费决定老师对其子女的总体评价","城市居民为孩子购买课外读物的花费与老师对其孩子的总体评价之间存在中等程度的相关","一位研究者随机调查了50名城市居民为孩子购买课外读物的花费,另外还搜集了老师对这些孩子的总体评价,得到积差相关系数为0.53.列推断中正确的是()",{"answer":62,"createTime":35,"id":63,"options":64,"question":69,"source":31,"type":32},[],100429994,[65,66,67,68],"正相关","负相关","零相关","完全相关","初学打字时,随着练习增多错误就减少,这属于( )",{"answer":71,"createTime":35,"id":72,"options":73,"question":78,"source":31,"type":32},[],100429995,[74,75,76,77],"前者比后者更密切","后者比前者更密切","相同","不确定","比较相关系数为-0.6的两列变量与相关系数为0.6的两列变量之间的关系程度.会发现( )",{"answer":80,"createTime":35,"id":81,"options":82,"question":87,"source":31,"type":32},[],100429996,[83,84,85,86],"散点图","线形图","圆形图","直方图","确定变量之间是否存在相关关系以及关系紧密程度的简单而直观的方法是制作()",{"answer":89,"createTime":35,"id":90,"options":91,"question":96,"source":31,"type":32},[],100429997,[92,93,94,95],"0.05","0.28","0.56","3.33","一对n=6的变量X,Y的方差分别是8和18,离均差的乘积和40.32 ,变量X,Y的积差相关系数是()",{"answer":98,"createTime":35,"id":99,"options":100,"question":101,"source":31,"type":32},[],100429998,[38,39,40,41],"两个总体正态分布的变量X,Y的方差分别是4和2,协方差,1.95,它们之间的积差相关系数是()",{"answer":103,"createTime":35,"id":104,"options":105,"question":110,"source":31,"type":32},[],100429999,[106,107,108,109],"0.73","0.54","0.65","0.27","有10名学生参加视反应时和听反应时两项测试,数据整理后得到 ,则这两项能力之间的等级相关系数是()"]