Statistical Analysis of Trends in the Red River Over a 45 Year Period

Table 3.2: Five Number Summaries for Selected Constituents
Station First Third
# Min. Quartile Median Quartile Max. Mean Std. Dev.
Calcium, dissolved (mg/l)
1. 4.60 56.30 63.90 72.98 130.00 64.48 13.53
2. 46.90 48.53 59.25 67.13 67.80 58.30 9.84
3. 44.30 57.35 67.70 70.00 77.70 64.09 9.85
Sodium, dissolved (mg/l)
1. 1.70 25.00 34.00 47.00 305.00 42.43 32.64
2. 20.40 23.78 34.10 34.75 34.90 30.88 7.00
3. 20.10 21.75 45.40 53.25 57.20 39.72 15.04
Potassium, dissolved (mg/l)
1. 0.38 5.48 6.40 7.54 18.40 6.59 1.82
2. 4.70 4.85 5.55 6.48 6.70 5.63 0.85
3. 6.80 7.15 7.60 8.75 8.90 7.90 0.84
Magnesium, dissolved (mg/l)
1. 3.30 27.00 31.25 36.68 61.00 31.90 8.56
2. 19.40 21.08 27.50 32.65 33.90 27.08 6.05
3. 18.60 27.95 31.50 35.85 40.40 31.30 6.44
Sulphate, dissolved (mg/l)
1. 4.00 69.60 92.20 119.00 1050.00 99.04 55.78
2. 40.00 76.13 94.50 118.50 220.00 98.86 37.67
3. 32.00 100.00 128.50 160.00 240.00 127.81 44.71
Chloride, dissolved (mg/l)
1. 0.10 21.70 31.00 50.00 473.00 46.33 51.09
2. 8.40 16.75 25.10 36.30 160.00 32.99 28.98
3. 6.10 20.00 32.20 42.40 120.00 35.39 22.08
Total Dissolved Solids (mg/l)
1. 0.00 375.00 447.50 527.40 1289.00 459.46 140.10
2. 210.00 425.00 550.00 670.00 1140.00 564.66 200.74
3. 240.00 450.00 510.00 600.00 1500.00 535.44 152.03
Specific Conductance (USIE/cm 2 )
1. 278.00 585.00 676.00 806.00 2253.00 716.79 230.49
2. 7.70 592.00 700.00 821.00 1875.00 741.06 261.86
3. 157.00 621.80 756.50 867.00 1497.00 757.30 223.68
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