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Table 6 Summary of pretest and posttest results

From: Evolution and Medicine: An Inquiry-Based High School Curriculum Supplement

 

Pretest mean number correct

Posttest mean number correct

t test

Cohen’s d effect size (lower, upper 95% confidence intervals)

Complete test (10 items)

4.47

5.69

p < .001

0.7 (.58, .80)

Common ancestry only (5 items)

1.66

2.63

p < .001

0.8 (.70, .92)

Natural selection only (5 items)

2.81

3.04

p < .001

0.2 (.10, .31)