Table 1. Measures of central tendency of the scores obtained by students in different periods of evaluation. Coimbra, Portugal, 2012.

Measures of central tendency		Pre-test score	Midterm test score	Poss-test score
n
	Valid	14	14	14
	Loss	0	0	0
Mean		53.9	68.2	90.3
Median		60.0	70.0	95.0
Mode		40.0	70.0	90.0
Standard deviation		15.2	13.5	12.78
Minimum		20.0	40.0	55.0
Maximum		75.0	90.0	100.0
Percentile
	25	40.0	60.0	90.0
	50	60.0	70.0	95.0
	75	65.0	77.5	100.0