Assessment of the Nutrients in the Leachate and the Groundwater Quality for Drinking and Farming around the Nkolfoulou Landfill in Yaoundé, Cameroon

Table 8

Student’s t-test.

Paired variable		Descriptive statistics		Paired differences		t	df	value
		Dry season	Wet season	95% confidence interval of the difference
		Mean (SD)	Mean (SD)	Lower	Upper
pH (d)-pH (w)	13	5.592 (0.317)	6.139 (0.189)	−0.752	−0.340	−5.781	12	0.000
T (d)-T (w)	13	26.454 (0.078)	26.262 (0.185)	0.075	0.309	3.584	12	0.004
EC (d)-EC (w)	13	74.615 (36.882)	50.769 (33.531)	4.337	43.356	2.663	12	0.021
TDS (d)-TDS (w)	13	31.539 (17.246)	34.615 (52.538)	−32.925	26.771	−0.225	12	0.826
TSS (d)-TSS (w)	13	27.143 (27.748)	28.396 (29.632)	−5.749	3.243	−0.607	12	0.555
Turb (d)-turb (w)	13	3.792 (3.894)	3.962 (4.160)	−0.797	0.459	−0.587	12	0.568
TH (d)-TH (w)	13	29.142 (9.608)	25.926 (10.472)	−2.093	8.525	1.320	12	0.211
TA (d)-TA (w)	13	34.654 (18.509)	29.392 (10.856)	−5.748	16.271	1.041	12	0.318
(d)- (w)	13	4.065 (5.949)	1.175 (0.510)	−0.906	6.685	1.659	12	0.123
(d)- (w)	13	0.130 (0.150)	0.180 (0.234)	−0.224	0.124	−0.626	12	0.543
(d)- (w)	13	2.462 (1.243)	2.301 (1.926)	−1.386	1.709	0.227	12	0.824
(d)-(w)	13	2.466 (1.594)	1.983 (1.203)	−0.611	1.577	0.962	12	0.355
(d)- (w)	13	7.605 (3.444)	7.115 (4.338)	−0.824	1.805	0.813	12	0.432
(d)- (w)	13	0.045 (0.018)	0.041 (0.024)	−0.012	0.020	0.534	12	0.603
(d)- (w)	13	1.015 (0.968)	0.492 (0.244)	−0.091	1.138	1.857	12	0.088
(d)- (w)	13	3.759 (2.879)	2.287 (2.194)	−0.783	3.727	1.423	12	0.180
(d)- (w)	13	0.005 (0.010)	0.008 (0.010)	−0.011	0.005	−0.805	12	0.436
(d)-(w)	13	1.275 (1.006)	0.780 (1.025)	−0.192	1.183	1.569	12	0.143
(d)- (w)	13	42.264 (22.562)	35.843 (13.239)	−6.993	19.835	1.043	12	0.318

d = dry season; w = wet season; turb = turbidity. Bolded figures indicate significant difference.