Accuracy Estimation. 12 of 16 participants rated their accuracy best for the large target size. All the 16 participants thought to have performed worst for the small target size. A non-parametric Friedmann test shows that the participants’ rating of their own accuracy was significantly affected by target size (χ2(2) = 7.59, p < .03). Wilcoxon tests were used in order to follow-up this result. A Bonferroni correction was used and all the results are reported at a significance level of .025. It appeared that the small target size compared to the medium target size significantly affected the accuracy estimation (Z = 3.76, r = .66) as well as the large target size compared to the medium target size did (Z = 2.32, r = .41).