Statistics for Environmental Engineers

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References


Box, G. E. P., G. M. Jenkins, and G. C. Reinsel (1994). Time Series Analysis, Forecasting and Control, 3rd ed., Englewood Cliffs, NJ, Prentice-Hall.


Chatfield, C. (1988). Problem Solving: A Statistician’s Guide, London, Chapman & Hall.


Chatfield, C. (1991). “Avoiding Statistical Pitfalls,” Stat. Sci., 6(3), 240-268.


Cryer, J. D. (1986). Time Series Analysis, Duxbury Press, Boston.


Tukey, J. W. (1977). Exploratory Data Analysis, Reading, MA, Addison-Wesley.

Exercises


4.1 Cadmium. The data below are influent and effluent cadmium at a wastewater treatment plant. Use graphical and smoothing methods to interpret the data. Time runs from left to right.


Inf. Cd (Ug/L)


2.5


2.3


2.5 2.8


2.8 2.5


2.0


1.8


1.8


2.5


3.0


2.5


Eff. Cd (jUg/L)


0.8


1.0


0.0 1.0


1.0 0.3


0.0


1.3


0.0


0.5


0.0


0.0


Inf. Cd (Ug/L)


2.0


2.0


2.0 2.5


4.5 2.0


10.0


9.0


10.0


12.5


8.5


8.0


Eff. Cd (Ug/L)


0.3


0.5


0.3 0.3


1.3 1.5


8.8


8.8


0.8


10.5


6.8


7.8


PCBs. Use smoothing methods to interpret the series of 26 PCB concentrations below. Time


runs from left to right.


29 62


33


189


289 135


54


120

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