Statistics for Environmental Engineers

Скачать в pdf «Statistics for Environmental Engineers»

Exercises


31.1 BOD/COD Correlation. The table gives n = 24 paired measurements of effluent BOD5 and COD. Interpret the data using graphs and correlation.


COD (mg/L)


4.5


4.7


4.2


9.7


5.8


6.3


8.8


5.7


6.3


9.7


15.4


12.0


BOD (mg/L)


5.0


4.1


6.7


5.0


5.0


3.8


6.1


4.1


4.2


4.3


4.0


3.7


COD (mg/L)


8.0


11.1


7.6


8.1


7.3


8.5


8.6


7.8


7.2


7.9


6.4


5.7


BOD (mg/L)


5.7


5.4


4.4


5.9


4.9


4.9


5.5


3.5


4.3


5.4


4.2


3.9

32.2 Heavy Metals. The data below are 21 observations on influent and effluent lead (Pb), nickel (Ni), and zinc (Zn) at a wastewater treatment plant. Examine the data for correlations.


Inf. Pb


Eff. Pb


Inf. Ni


Eff. Ni


Inf. Zn


Eff. Zn


18


3


33


25


194


96


3


1


47


41


291


81


4


1


26


8


234


63


24


21


33


27


225


65


35


34


23


10


160


31


31


2


28


16

Скачать в pdf «Statistics for Environmental Engineers»