Manipulation Check
One-way repeated measures analysis of variance (ANOVA) showed that
choice set size had a significant effect on the perception of the number
of options (F (3,81) = 27.8, p < 0.001,η 2 = 0.507, Fig 2A ). Post hoc tests
suggested that the differences between the four different sizes of
choice sets were all statistically significant, indicating that the
manipulation of choice set size was successful (ps <
0.025).