close to being significantp = 0.053
The main effect of preference was not significant, χ 2 (1) = 0.720, p = 0.396, while the interaction of preference and effort level was close to being significant, χ 2 (1) = 3.738, p = 0.053, with the slope of the effort predictor however being higher for effort versus reward preferences, t = 1.970, p = 0.049 (see also Fig. 5 a).