UV Spectrophotometric Simultaneous Determination of Paracetamol and Ibuprofen in Combined Tablets by Derivative and Wavelet Transforms

Table 3

Results of ANOVA and Bartlett tests at the significance level of 5% by applying spectrophotometric and chromatographic methods to three commercial pharmaceutical formulations.

ANOVA test
Source of variation	Compound		Between groups	Within groups	Total
Sum of squares	IB	I	25.11	110.90	136.01
		II	12.70	146.20	158.90
		III	28.56	90.00	118.56
	PA	I	24.15	93.55	117.70
		II	35.46	118.45	153.91
		III	17.99	89.90	107.89
Degree of freedom			15	80	95
Mean of squares	IB	I	1.674	1.386
		II	0.847	1.827
		III	1.904	1.125
	PA	I	1.610	1.169
		II	2.364	1.481
		III	1.199	1.124
Calculated 𝐹 value	IB	I	1.207
		II	0.464
		III	1.692
	PA	I	1.377
		II	1.597
		III	1.067
Tabulated 𝐹 value			1.793
Bartlett test
Degree of freedom			15
Calculated χ ^2 value	IB	I	6.923
		II	6.201
		III	6.506
	PA	I	7.352
		II	5.810
		III	2.870
Tabulated χ ^2 value			24.996

I: Alaxan; II: Dibulaxan; III: Febro.