回归直线方程一定过样本的中心点(
.
x ,
.
y ),
.
x =
1.08+1.12+1.19+1.28
4 =1.1675,
.
y =
2.25+2.37+2.40+2.55
4 =2.3925,
∴样本中心点是(1.1675,2.3925),
故答案为 (1.1675,2.3925).
回归直线方程一定过样本的中心点(
.
x ,
.
y ),
.
x =
1.08+1.12+1.19+1.28
4 =1.1675,
.
y =
2.25+2.37+2.40+2.55
4 =2.3925,
∴样本中心点是(1.1675,2.3925),
故答案为 (1.1675,2.3925).