Statistics for Environmental Engineers

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22.3    Planning. Select one of the following experimental problems and (a) list the experimental factors, (b) list the responses, and (c) explain how you would arrange an experiment. Consider this a brainstorming activity, which means there are no wrong answers. Note that in 3, 4, and 5 some experimental factors and responses have been suggested, but these should not limit your investigation.

1.    Set up a bicycle for long-distance riding.

2.    Set up a bicycle for mountain biking.

3.    Investigate how clarification of water by filtration will be affected by such factors as pH, which will be controlled by addition of hydrated lime, and the rate of flow through the filter.

4.    Investigate how the dewatering of paper mill sludge would be affected by such factors as temperature, solids concentration, solids composition (fibrous vs. granular material), and the addition of polymer.

5.    Investigate how the rate of disappearance of oil from soil depends on such factors as soil moisture, soil temperature, wind velocity, and land use (tilled for crops vs. pasture, for example).

6.    Do this for an experiment that you have done, or one that you would like to do.

22.4    Soil Sampling. The budget of a project to explore the extent of soil contamination in a storage area will cover the collection and analysis of 20 soil specimens, or the collection of 12 specimens with duplicate analyses of each, or the collection of 15 specimens with duplicate analyses of 6 of these specimens selected at random. Discuss the merits of each plan.

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