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Table 6 Comparison of performance on GeDI by form, course, and region

From: Testing validity inferences for Genetic Drift Inventory scores using Rasch modeling and item order analyses

Course, region (number tested) Mean of items correct (SD)
300-level genetics, Northeast (N = 336)a 12.11 (3.59)
 Form 1 (n = 81)a 12.02 (3.30)
 Form 2 (n = 78)a 12.15 (3.61)
 Form 3 (n = 80)a 12.20 (3.98)
 Form 4 (n = 87)a 12.09 (3.54)
300-level genetics, Southeast (N = 318)b 12.35 (3.29)
300-level genetics, Midwest (N = 141)b 11.94 (3.35)
300-level cell biology, Northwest (N = 51)b 13.35 (3.64)
300-level evolution, Northwest (N = 91)b 14.47 (3.78)
400-level evolution, Midwest (N = 60)b 16.66 (3.44)
  1. All institutions were Doctoral-granting. Maximum number of correct items is 22
  2. Raw scores were used for comparison as Rasch-scaled data were not available from prior studies
  3. aDenotes present study
  4. bDenotes data from Price et al. 2014