Statistical Analysis

Concentrations of dis- solved Oxygen in ppm

Site 1

Site 2

Site 3

Site 4

Totals

X

X squ.

X

X squ.

X

X squ

X

X squ.

Field Readings

10

100

8.8

77.44

9

81

11.8

139.24

9.8

96.04

10.8

116.64

7

49

11.2

125.44

10.3

106.09

9

81

7.6

57.76

9

81

10

100

9

81

7.2

51.84

8.4

70.56

Sum X

40.1

37.6

30.8

40.4

Sum X squared

402.03

356.08

239.6

416.24

Mean

10

9.4

7.7

10.1

(Sum X) squared/n

402

353.44

237.16

408.04

Sum x squared

0.13

2.64

2.44

8.2

13.41

n (number of readings)

4

4

4

4

degrees of freedom

3

3

3

3

12

Pooled s squared

1.12

Standard Deviation

0.747

Level of Significant Difference (5%)

1.63

Concentration of dissolved Oxygen in ppm

Only Site 3 has a significantly different amount of dissolved oxygen.

Statistical Analysis of Water Temperature, pH, Carbon Dioxide Concentration

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