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Table 6.
Chi-square goodness-of-fit comparison, by semester, between pretest and posttest percentages of students correctly responding to the question “If no mutation occurs to affect the running speed, what will most likely happen to the running speed of predator and prey populations over time?”
Spring 2017Fall 2017Spring 2018
Pretest percent 18 28 23 
Posttest percent 49 52 59 
n 55 65 71 
χ2 11.77 8.21 19.7 
p <0.001 0.004 <0.001 
Cramer's V 0.462 0.355 0.527 
Spring 2017Fall 2017Spring 2018
Pretest percent 18 28 23 
Posttest percent 49 52 59 
n 55 65 71 
χ2 11.77 8.21 19.7 
p <0.001 0.004 <0.001 
Cramer's V 0.462 0.355 0.527 
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