Statistics for Environmental Engineers

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Box, G. E. P., W. G. Hunter, and J. S. Hunter (1978). Statistics for Experimenters: An Introduction to Design, Data Analysis, and Model Building, New York, Wiley Interscience.

Dunnett, C. W. (1955). “Multiple Comparison Procedure for Comparing Several Treatments with a Control,” J. Am. Stat. Assoc., 50, 1096-1121.

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Rohlf, F. J. and R. R. Sokal (1981). Statistical Tables, 2nd ed., New York, W. H. Freeman & Co.

Sokal, R. R. and F. J. Rohlf (1969). Biometry: The Principles and Practice of Statistics in Biological Research, New York, W. H. Freeman and Co.

Tukey, J. W. (1949). “Comparing Individual Means in the Analysis of Variance,” Biometrics, 5, 99.

Tukey, J. W. (1991). “The Philosophy of Multiple Comparisons,” Stat. Sci., 6(6), 100-116.


20.1 Storage of Soil Samples. The concentration of benzene (ug/g) in soil was measured after being stored in sealed glass ampules for different times, as shown in the data below. Quantities given are average ± standard deviation, based on n = 3. Do the results indicate that storage time must be limited to avoid biodegradation?

Day 0

Day 5

Day 11

Day 20

6.1 ± 0.7

5.9 ± 0.2

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