Algebra-based (’00)     Calc-based (’95)
									F					N						U											F					N					U
				Pre					66%					30%						4%						Pre					60%					21%					19%
	#4 #13 #14 #19
				Post					91%					9%						0%						Post					77%					13%					10%
				Pre					57%					40%						3%						Pre					54%					24%					22%
				Post					79%					19%						2%						Post					49%					23%					28%
				Pre					36%					53%						11%						Pre					39%					28%					33%
				Post					64%					34%						2%						Post					37%					24%					39%
				Pre					45%					45%						10%						Pre					43%					32%					25%
				Post					72%					26%						2%						Post					46%					26%					28%