某医院用光电比色计检验尿汞时,得尿汞含量(mg/L)与消光系数读数的

某医院用光电比色计检验尿汞时,得尿汞含量(mg/L)与消光系数读数的结果如下:

尿汞含量x

2

4

6

8

10

消光系数y

64

138

205

285

360

求回归方程.

答案

解析:可作散点图,观察x、y的关系满足线性关系,代入公式求方程.

:作散点图,可知y与x有线性关系,设为y=a+bx,

==6,==210.4,

=220,yi=7 790,

b==36.95,

a=-b=210.4-36.95×6=-11.3,

∴回归方程为y=-11.3+36.95x.

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