Observing populations and testing predictions about genetic drift in a computer simulation improves college students’ conceptual understanding

Table 2 Courses in the control treatment

Institution, region	N	Division (course)	GeDI administered as…	Credit for GeDI	Days between pre- and posttest
Master’s University, West	28	Lower (general biology)	Homework	Completion	16 (SD 7)
Master’s University, West	14	Upper (evolution)	Homework	Completion	18 (SD 8)
Moderate Research University, West	24	Lower (general biology)	Homework	Completion	97 (SD 4)
Research University, Midwest 2	112	Upper (genetics)	In class activity	Completion	17 (SD 3)
Research University, Northeast 2	137	Lower (general biology)	Homework	Completion	20 (SD 4)

All students received credit for completing the GeDI, but their GeDI scores did not affect their grades. The classifications of institutions are simplified from the Carnegie Classification of Institutions of Higher Education (The Carnegie Classification of Institutions of Higher Education n.d., http://carnegieclassifications.iu.edu/)

ISSN: 1936-6434