Table 4.

Binomial tests comparing extensive and normal forms

Test	Treatment (Research hypothesis)	Extensive form proposition, xe/Ne*	Normal form proposition, xn/Nn†	Unit normal deviate approximation of binomial‡	P
1 Left play more likely	Single (Extensive > matrix normal)	12/26	7/24	1.23	0.11
2 Left: Cooperation more likely	Single (Extensive > matrix normal)	6/12	1/7	1.61	0.05
3 Right: Noncooperation more likely	Single (Extensive > matrix normal)	14/14	14/17	1.66	0.05

*x_e is number of pairs playing left branch in the extensive form out of a total of N_e playing left or right. 

^†x_n is number of pairs playing left branch in the normal form out of a total of N_n playing left or right. 

^‡All tests are one-tailed based on a priori prediction of which outcomes will be greatest.