Statistic
EC
TDS
TH
Cl−
Na+
Ca2+
Mg2+
K+
CWQI-OBS
No. of observations
32
32
32
32
32
32
32
32
32
32
32
Minimum
155.0
97.0
60.0
44.8
17.3
6.9
13.4
15.9
5.6
1.4
58.2
Maximum
848.0
548.0
360.0
436.4
190.2
101.0
115.2
80.1
41.0
4.3
91.8
Range
693.0
451.0
300.0
391.6
172.8
94.1
101.8
64.2
35.4
2.9
33.6
1st Quartile
327.5
209.0
116.5
77.1
29.6
17.9
23.9
31.1
9.2
1.8
82.9
Median
417.0
265.5
144.5
111.4
39.9
24.4
32.0
40.1
15.1
2.0
84.6
3rd Quartile
588.5
379.3
183.8
191.7
57.1
39.9
46.0
51.9
17.4
2.9
89.1
Mean
461.0
292.8
162.0
154.2
52.6
32.5
40.3
42.1
15.4
2.3
84.6
Variance (n)
35013.1
14187.8
5015.3
10825.9
1507.2
485.4
569.7
239.2
65.8
0.6
44.8
Standard deviation (n)
187.1
119.1
70.8
104.0
38.8
22.0
23.9
15.5
8.1
0.8
6.7
Skewness (Pearson)
0.5
0.5
1.1
1.2
2.2
1.4
1.4
0.5
1.3
0.8
−2.0
Kurtosis (Pearson)
−0.8
−0.7
0.8
0.3
4.4
1.4
1.5
−0.2
1.4
−0.4
5.4
Standard error of the mean
33.6
21.4
12.7
18.7
7.0
4.0
4.3
2.8
1.5
0.1
1.2