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Fig. 2 | BMC Medical Education

Fig. 2

From: Comparison of long-menu and single-best-answer multiple choice questions in computer-based summative assessments: a randomised controlled trial

Fig. 2

Sequential design interim results and boundaries. Estimates of the differences in discriminatory power between the long-menu and Type A question formats (three points joined with dashed lines) and stopping boundaries of the sequential procedure (solid lines). The dotted lines represent the initial stopping boundaries, and the continuous lines represent the readjusted boundaries at Step 3 (88 observations) taking into account the sequential estimated values of the variability parameters

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