Table 1.

Post-test scores, by explanation type and spatial ability

	Explanation type
	Visual		Verbal		Total
Spatial ability	Mean	SD	Mean	SD	Mean	SD
Low	11.45	1.93	9.75	2.31	10.60	2.27
High	11.20	1.47	11.60	1.80	11.42	1.65
Total	11.3	1.71	10.74	2.23