Correction

Figures & data

Figure 1. Distribution of threshold values by type of item: simple (left) and complex (right) MC.

Figure 2: Boxplots for item accuracies by type of behavior and type of item: simple (left) and complex (right) MC.

Figure 3. Scatterplots for the accuracy of rapid-guessing (RG) versus solution-based behavior (SB) for simple (left) and complex (right) MC items under sample size and key conditions.

Figure 4. Histogram for the number of students engaging in solution-based behavior on the 114 MC items.

Table 1. Descriptive statistics for threshold and number of examinees by type of response behavior.

Statistics per item	Simple MC				Complex MC
	Mean	SD	Median	Range	Mean	SD	Median	Range
Threshold	5.00	1.52	4.9	2.9-8.6	5.55	1.94	5	2.6-10
No. of rapid-guessers	47.19	35.25	41	0-145	32.15	33.66	22	1-208
% of rapid guessers	5.44%	3.49%	5%	0.0%-14.40%	3.33%	2.91%	3%	0.20%-17.00%
No. of solution behaviors	823.45	292.38	609	488-1271	927.02	293.02	1093	539-1236

Note. SD = standard deviation.

Table 2. Descriptive statistics for accuracy level by type of response behavior.

Statistics per item	Simple MC				Complex MC
	Mean	SD	Median	Range	Mean	SD	Median	Range
Accuracy level of rapid-guessing behavior	34.50	17.21	33.1	0-100	26.26	22.52	21.1	0-100
Accuracy level of solution behavior	46.98	13.95	43.5	20.9-82.6	36.62	17.42	34.6	1.8-81.6

Note. SD = standard deviation.