Table 4.

Statistical comparison for the results obtained by the proposed method and the official methods for the determination of PAR and PHE in pure powder form.

	CZE		Official method
	PAR	PHE	PAR*[2]	PHE**[1]
Mean	99.86	100.05	100.16	100.18
S.D.	0.660	0.649	0.792	0.952
Variance	0.436	0.421	0.627	0.906
n	7	7	6	6
Student’s t-test*** (2.201)	0.728	0.283
F value***(4.39)	1.44	2.152

^*Direct UV spectrophotometric determination at 244 nm.

^**Potentiometric titration method.

^***Figures between parentheses represent the corresponding tabulated values of t and F at p = 0.05.