n=10 is a small set. In addition, you don't know if there is a prior bias here. Say most of the 10 grads use syntax colors in their daily work. This is likely t

n=10 is a small set. In addition, you don't know if there is a prior bias here. Say most of the 10 grads use syntax colors in their daily work. This is likely to perturb the numbers. Figure 2 shows the plain samples have much greater variance, but does that translate to significance? Some analysis here would be nice, but with n=10 you don't have enough samples for this to be significant I'd wager. Also, the test should have thrown in a color scheme which nobody has ever used as a control. I think the choice of color scheme matters a great deal as well.