Table 2.

Two-way analysis of variance.

Effect	Sum of squares	df	Mean-squared	F	p
Material	0.005	1	0.005	1.690	0.200
Technique	0.514	5	0.103	34.963	0.000
Material*Technique	0.112	5	0.022	7.599	0.000
Error	0.141	48	0.003