Assume that the MSE for the magnitude of reward experiment were 5 and that there were 10 subjects per group. The group means are:

Reward size Time 2 10 4 6 6 4 8 3The table on the previous page shows that the coefficients for the linear component of trend with four groups are:

-3, -1, 1, 3.

Applying the formulas for a comparison presented elsewhere:

L = ΣM

= 3.162.

t = -23/3.162 = -7.27.