Table 12.

Chi-square table of algorithm variability (expert model) versus users reported skill shows statistically significant results (${\mathit{\chi }}^2=72.19,p<0.01$)

Group: categories	Easy	Same	Challenging	Total
Beginner	67 [42.54]	68 [77.54]	5 [19.92]	140
Intermediate	12 [25.83]	57 [47.08]	16 [12.10]	85
Advanced	0 [10.63]	19 [19.38]	16 [4.98]	35
Total	79	144	37	260

Number in the squared parentheses indicate the expected value of each group in the particular category