If N Ss answer an item having equally plausible alternatives on the punchboard, the errors to any particular will be N/2. This relationship is independent of the number of item choices available. A similar relationship is specified for an item in which all distractors but not the correct answer are equally plausible.
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References
1.
KaessW. A., & ZeamanD.Positive and negarive knowledge of results on a Pressey-type punchboard. J. exp. Psychol., 1960, 60, 12–17.
2.
PresseyS. L.Development and appraisal of devices providing immediate automatic scoring of objective tests and concomitant self-instruction. J. Psychol., 1950, 29, 417–447.
