Choice reaction index

Experimental group

(n = 1020)

χ2

Control group

(n = 1112)

χ2

χ2

a1)

b2)

a3)

b4)

1) 3)

2) 4)

Qualified

876

929

13.509*

956

983

2.934

0.003

4.126*

Unqualified

144

91

156

129