Table 2.

Power for comparison of quiz pre- and post-test, in relation to number of participants (N), proportion of learners (plearn) and increase in quiz score in learners (Quiz gain).

parameters	N = 50	N = 75	N = 100
Quiz gain = 1
plearn = 0	0.02	0.03	0.03
plearn = 0.25	0.14	0.18	0.24
plearn = 0.33	0.22	0.32	0.43
plearn = 0.50	0.45	0.64	0.8
Quiz gain = 2
plearn = 0	0.04	0.04	0.03
plearn = 0.25	0.38	0.6	0.71
plearn = 0.33	0.62	0.82	0.91
plearn = 0.50	0.93	0.98	1