Page 64 - Statistics for Environmental Engineers

L1592_frame_C06 Page 56 Tuesday, December 18, 2001 1:43 PM

TABLE 6.1
Data Used to Plot Figure 6.1 and the Associated External Reference Distributions
6.79 6.84 6.85 6.47 6.67 6.76 6.75 6.72 6.88 6.83 6.65 6.77 6.92 6.73 6.94 6.84 6.71
6.88 6.66 6.97 6.63 7.06 6.55 6.77 6.99 6.70 6.65 6.87 6.89 6.92 6.74 6.58 6.40 7.04
6.95 7.01 6.97 6.78 6.88 6.80 6.77 6.64 6.89 6.79 6.77 6.86 6.76 6.80 6.80 6.81 6.81
6.80 6.90 6.67 6.82 6.68 6.76 6.77 6.70 6.62 6.67 6.84 6.76 6.98 6.62 6.66 6.72 6.96
6.89 6.42 6.68 6.90 6.72 6.98 6.74 6.76 6.77 7.13 7.14 6.78 6.77 6.87 6.83 6.84 6.77
6.76 6.73 6.80 7.01 6.67 6.85 6.90 6.95 6.88 6.73 6.92 6.76 6.68 6.79 6.93 6.86 6.87
6.95 6.73 6.59 6.84 6.62 6.77 6.53 6.94 6.91 6.90 6.75 6.74 6.74 6.76 6.65 6.72 6.87
6.92 6.98 6.70 6.97 6.95 6.94 6.93 6.80 6.84 6.78 6.67
Note: Time runs from left to right.

7.2
7.0
pH 6.8
6.6
6.4
6.2
0 25 50 75 100 125 150
Days

FIGURE 6.1 Time series plot of the pH data with the moving average of ten consecutive values.

6.90
pH (-10 day MA) 6.80
6.85

6.75

6.70
0 25 50 75 100 125 150
Observation

FIGURE 6.2 Ten-day moving averages of pH.

15

Frequency 10

5

0
6.76 6.8 6.84 6.88
10-day Moving Average of pH

FIGURE 6.3 External reference distribution for ten-day moving averages of pH.

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