Thermal Decomposition Behaviour of Foundry Sand for Cast Steel in Nitrogen and Air Atmospheres

Table 5

Single-factor analysis of variance results.

Atmosphere	Source of variation	Sum of squares	Degrees of freedom	Mean square	F	Probability
Nitrogen	Model error	1.13	1	1.13	1877	0
	Random error	1.63 × 10^−2	27	6.03 × 10^−4
	Total	1.15	28
Air	Model error	4.99	1	4.99	3110	0
	Random error	4.34 × 10^−2	27	1.61 × 10^−3
	Total	5.04	28