University of California Press

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 2017	Fall 2017	Spring 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 2017	Fall 2017	Spring 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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