三点(3,10),(7,20),(11,24)的线*回归方程为( )A.=1.75x-5.75 ...
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问题详情：
三点(3,10),(7,20),(11,24)的线*回归方程为( )
A.
=1.75x-5.75 B.
=1.75x+5.75
C.
=-1.75x+5.75 D.=-1.75x-5.75
【回答】
B.设回归直线方程为
=
x+
,
=
(x1+x2+x3)=7,
=
(y1+y2+y3)=18,
则=
=
=1.75.
=-
=18-1.75×7=5.75.
故
=1.75x+5.75.
知识点：统计案例
题型：选择题
