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5x3+2x 6x3+1 6x3+2x 6x2+2x
X1 X2
(Xl,X2) (Xl,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
(﹣2x2)3=﹣6x6 x2•x3=x6 6x4÷3x3=2x x2+x3=2x5
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
四格表的x2值为5 四格表的较正值x2为4.5 用x2=(|b-c|-1)/(b+c)计算x2值 用x2=(b-c/b+c)计算x2值 用x2=计算x2值
5x3+2x 6x3+1 6x3+2x 6x2+2x
x=2 x=0 x1=0, x2=2 x1=0, x2=-2
X1 X2 (Xl,X2) (Xl,X2,X3,X4)