Statistics for Environmental Engineers

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Time


Treatment 1


Treatment 2


Treatment 3


0


1.14


0.61


2.66


2.50


0.44


0.44


5


0.63


0.81


2.69


2.96


0.25


0.31


12


0.43


0.54


1.14


1.51


0.18


0.22


17


0.35


0.51


1.00


0.48


0.15


0.12


24


0.35


0.34


0.93


1.16


0.11


0.09


29


0.32


0.30


0.73


0.96


0.08


0.10


36


0.23


0.20


0.47


0.46


0.07


0.06


41


0.20


0.16


0.57


0.36


0.03


0.04


48


0.12


0.09


0.40


0.22


0.03


0.03


53


0.11


0.08


0.32


0.31


0.02


0.03

40.2 1,1,1-Trichloroethane Biodegradation. Estimates of biodegradation rate (kb) of 1,1,1-trichlo-roethane were made under three conditions of activated sludge treatment. The model is yi = bxi + ei, where the slope b is the estimate of kb. Two dummy variables are needed to represent the three treatment conditions, and these are arranged in the table below. Does the value of kb depend on the activated sludge treatment condition?


x (x106)


Zi


Z2


Z* x


Z* x


ji(x103)


61.2


0


0


0


0


142.3


9.8


0


0

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