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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