Table 13.

Chi-square table of algorithm variability (User “best” model) versus users reported skill give statistically significant results (${\mathit{\chi }}^2=37.34$, $p<0.01$)

Group: categories	Easy	Same	Challenging	Total
Beginner	30 [18.84]	71 [71.27]	11 [21.89]	112
Intermediate	7 [13.79]	57 [52.18]	18 [16.03]	82
Advanced	0 [4.37]	12 [16.55]	14 [5.08]	26
Total	37	140	43	220

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