Statistics for Environmental Engineers

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Lab 1


26.1


21.5


22.0


22.6


24.9


22.6


23.8


23.2


Lab 2


18.3


19.7


18.0


17.4


22.6


11.6


11.0


15.7


Lab 3


19.1


13.9


15.7


18.6


19.1


16.8


25.5


19.7


Lab 4


30.7


27.3


20.9


29.0


20.9


26.1


26.7


30.7

24.2 Aerated Lagoon. Conductivity measurements (umho/cm) were taken at four different locations in the aerated lagoon of a pulp and paper mill. The lagoon is supposed to be mixed by aerators so the contents are homogeneous. Is the lagoon homogeneously mixed?


Location A


Location B


Location C


Location D


620


630


680


560


600


670


660


620


630


710


710


600


590


640


670


610


650


680


630


660


680


640


630


590

24.3 Adsorption. Six identical column adsorption units were fed identical influent for 20 weeks, with the exception that the influent to three units had a surfactant added. The data below are weekly average effluent concentrations. Can you discover from analysis of variance which units received surfactant? Has the surfactant affected the performance of the adsorption units?


ReactorWeek


1


2


3


4

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