Statistics for Environmental Engineers

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Rajagopal, R. and L. R. Williams (1989). “Economics of Compositing as a Screening Tool in Ground Water Monitoring,” GWMR, Winter, pp. 186-192.

Exercises


25.1 Fish Liver. The livers of four fish were analyzed for a bioaccumulative chemical. Three replicate measurements were made on each liver. Using the following results, verify that the variance between fish is significantly greater than the analytical variance.


1


0.25


0.22


0.23


2


0.22


0.20


0.19


3


0.19


0.21


0.20


4


0.24


0.22


0.22

25.2 Industrial Waste. The data below represent six deliveries of industrial waste to a municipal wastewater treatment plant. Two batches were collected at random from each delivery, and four tests were done on each batch. Analyze the data to determine the amount of variability due to delivery (D), batch (B), or test (C).


Delivery 1 Delivery 2 Delivery 3 Delivery 4 Delivery 5 Delivery 6


B1


B2


B1


B2


B1


B2


B1


B2


B1


B2


B1


B2


35.6


38.6


30.7


31.7


30.0


27.9


34.3


38.7


33.2


35.8


39.5


38.7


33.6


41.6


30.5


30.0


35.0


27.7


36.4


38.5


35.2


37.1


42.1


36.1


34.1


40.7


27.2


33.8


35.0


29.0


33.4


43.3


37.8


37.1

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