Academic Lineage and Student Performance in Medical School Page: 48
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48
Performance on the USMLE, Step 1
The data for hypothesis 8 which stated that no association exists between
admission selectivity group and student performance on the USMLE, Step 1 are
presented in Tables 26 and 27. Mean USMLE scores and the mean rank were calculated
for each admission selectivity group as part of the Kruskal-Wallis test. The null
hypothesis states that no difference exists between the group mean ranks. The test
statistic (Hc) was calculated at 18.213 which exceeded the critical value of chi square
(X20.05,3=7.815). Therefore, the null hypothesis was rejected.
Table 26
Hypothesis 8: Admission Selectivity Association with USMLE Score
Admission Students in Mean Sum of the Mean Rank
Selectivity Sample (N) USMLE Ranks (Kruskal -
Group Score Wallis)
Group A 60 200.28 22,028 367.14
(not selective)
Group B
265 205.61 116,735 440.51
(selective)
Group C
393 206.81 178,811 454.99
(highly selective)
Group D
198 211.44 102,414 517.24
(most selective)
Total 916 207.03 419,988
Table 27
Kruskal-Wallis Test Results
Admission Selectivity Group and USMLE Score
Test Statistic Value
Hc 18.213
X20.05,3 7.815
Table 28 presents the data for the multiple comparison tests between the
admission selectivity group for USMLE score to determine which groups differed.
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Wright, James Scott. Academic Lineage and Student Performance in Medical School, dissertation, August 1999; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc2206/m1/57/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .