Monitoring of CO₂ Absorption Solvent in Natural Gas Process Using Fourier Transform Near-Infrared Spectrometry

Table 3

Difference between the actual and predicted values for validation sample evaluated using t-test (paired two sample for means).

	Amine		CO2		Water
	Actual	Predicted	Actual	Predicted	Actual	Predicted
Mean	39.2875	53.5	4.0575	4.11125	54.83125	54.86125
Variance	158.7985	154.0814	2.458764	1.723298	154.4134	153.2284
Observations	8	8	8	8	8	8
Pearson correlation	−0.98999		0.890078		0.990796
Hypothesized mean difference	0		0		0
Df	7		7		7
t Calc	−1.61106		−0.21129		−0.05041
P (T ≤ t), one-tailed	0.0756		0.41934		0.480604
t critical, one-tailed	1.894579		1.894579		1.894579
P (T ≤ t), two-tailed	0.151201		0.838681		0.961207
t critical, two-tailed	2.364624		2.364624		2.364624