Table 2.

Descriptive statistics of the amount of driven Al₂O₃ abrasive depending on the main factors and the table of the analysis of variance.

		Arithmetic Mean	Standard Deviation	Standard Error of the Mean	Uniform Groups (Tukeys Post Hoc Test)
Material	alloy Ti	29.40	4.87	0.27	d
	alloy Ni/Cr	23.30	4.61	0.26	c
	alloy Co/Cr	20.85	3.97	0.22	b
	ZrO2	5.61	1.99	0.11	a
Gradation [μm]	50	18.02	8.01	0.39	a
	110	20.22	8.74	0.43	b
	250	21.13	11.56	0.56	c
Pressure [MPa]	0.2	17.02	7.75	0.38	a
	0.4	19.72	9.04	0.44	b
	0.6	22.63	11.04	0.54	c
		F	p	Eta-squared partially
Material		11,312.09	<0.0001	0.9652
Gradation [μm]		375.41	<0.0001	0.3802
Pressure [MPa]		1158.38	<0.0001	0.6543
Material*Gradation		261.33	<0.0001	0.5616
Material*Pressure [MPa]		170.07	<0.0001	0.4547
Gradation*Pressure [MPa]		7.27	<0.0001	0.0232
Material*Gradation*Pressure [MPa]		18.13	<0.0001	0.1509

Means marked with the same letter did not differ significantly from each other (p > 0.05), while if there was no common letter between the two compared means, then the means differed significantly (p > 0.05).