Table 7. Determination of assigned value of impurity A (n=18)

Parameters	Iteration
Parameters	0	1^st iteration	2^nd iteration	3^rd iteration	4^th iteration
δ = 1.5s*	-	0.127	0.114	0.111	0.111
x* - δ	-	98.89	98.90	98.90	98.90
x* + δ	-	99.14	99.13	99.12	99.12
Average	99.01	99.01	99.01	99.01	99.01
SD	0.069	0.067	0.065	0.064	0.064
New x*	99.01	99.01	99.01	99.01	99.01
New s*	0.084	0.076	0.074	0.073	0.073