Part I (Basic Science) Examination, December 2001 Statistical ...

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Basic Science, 12/01 2Table 1: Number of Test Items Administered and ScoredItemsAdministered Deleted ScoredOverall Test 435 12 423Human Biology 195 6 189Ocular/Visual Biology 90 3 87Theoretical, Ophthalmic,& Physiological Optics 125 3 122Psychology 25 0 25Figure 1: Histogram of Overall Test Scores____________________________ 40|||C||LEGEND |*||----------------------------| *||C=Pass-Fail Cutoff Score | *||M=Mean Score |*||B=Both Cutoff and Mean |*||*=1.3 Examinees |*F||____________________________| *|**R|**|***E|***|****Q|****** |******** U|******** |********** E|********** |********** N|************** |*************** C|*************** |**************** * Y|**************** * |****************** |******************** |********************** |*** *********************** |***** ************************* |******************************** **|************************************** *** ** 0|__________|_________|_________|_________|_________|_________|B________|_________|_________|_________|0102030405060708090100PERCENTAGESCORESThe National Board uses a criterion-based methodology to determine pass-fail standards.This methodology is based on many detailed consensual judgments by the Board's examinationcommittees regarding the difficulty of each test item. The difficulty of test items is based on ananalysis of each of the options within the items. This procedure is known as the Nedelsky/Grosstechnique. Articles describing this procedure, as well as an empirical study of its effectiveness,may be obtained by contacting the National Board office.
Basic Science, 12/01 3Table 2: Part Summary Statistics*Raw % ScaledScore Score ScoreDescriptive Data Score Range 60-364 14-86 146-684** Mean Score 257.1 60.8 298.5Median Score 259 61.2 300Standard Deviation 31.95 7.55Reliability Data KR-20 Reliability 0.92Kappa Reliability 0.71Standard Error of Measurementof all scores 9.10 2.15at the pass-fail cutoff score 9.13 2.16Pass-Fail Data Pass-Fail Score 259 61.2 300** Number (%) Passing 223 (50.9)Number (%) Failing 215 (49.1)* Part statistics are based on 423 test items and 438 candidates (47 or 10.7% of whom are first-timers). The data include one candidatewith unrepresentatively low scores because of sitting for only a portion of the test.** The mean score and pass rate of students sitting for Basic Science for the first time are 68.2% and 83.0%, respectively.Descriptive DataTable 3: Section Summary Statistics*TheoreticalOphthalmic &Human Ocular/Visual PhysiologicalBiology Biology Optics Psychology% Scaled % Scaled % Scaled % ScaledScore Score Score Score Score Score Score ScoreScore Range 14-90 17-93 18-92 22-94 11-87 14-91 16-96 20-97Mean Score 61.1 75.5 64.2 75.7 56.3 69.6 67.9 79.8Standard Deviation 8.32 9.56 8.80 10.72Pass-Fail Data**Pass-Fail Score 60.3 75 63.2 75 60.7 75 60.0 75% Passing 56.2 57.1 32.0 83.8% Failing 43.8 42.9 68.0 16.2* The data include one candidate with unrepresentatively low scores because of sitting for only a portion of the test.** Based on National Board criteria, candidates pass or fail Parts only, not sections. These section data are relevant only to applicablestate board requirements.The Part pass-fail cutoff score is scaled so that it always equals 300. Similarly, for thosestates that have subtest requirements, the sections are scaled so that 75 is reported as the cutoffscore. The scaled Part cutoff of 300 is equal to the weighted average of the section scaled cutoff
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Part I (Basic Science) Examination, December 2001 Statistical ...

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