Fig. 4
From: Exploring student understanding of the engineering design process using distractor analysis
Distractor analysis plot for item 14: full sample. The plot shows patterns of student answer choices for item 14 within the entire sample. The x-axis displays estimates of student achievement. Student achievement estimates are shown in logits, and these estimates were calculated using the Rasch model. Low values indicate lower achievement, and high values indicate higher achievement. The y-axis shows the observed proportion of responses for a given answer choice. The lines in the plot show the proportion of students who selected each of the four answer choices (A, B, C, or D) at each level of achievement. For this item, the correct response is D (black line with asterisk plotting symbols)