10. Pollution from Chemical Plants In Exercise 7 (Chapter 11 Review), you performed an analysis of variance to compare the mean levels of effluents in water at four different industrial plants. Five samples of liquid waste were taken at the output of each of four industrial plants. The data are shown in the table.

a. Do the data present sufficient evidence to indicate a difference in the levels of pollutants for the four different industrial plants? Test using the appropriate nonparametric test.

b. Find the approximate p-value for the test and interpret its value.

c. When the analysis of variance was performed in Chapter 11, the ANOVA F-test produced the test statistic F55.20 with p-value5.011. Compare these results with the results of part

a. Do they agree?
Explain.

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Plant Polluting Effluents (g/L of waste) ABCD 1.65 1.72 1.50 1.37 1.60 1.70 1.85 1.46 2.05 1.80 1.40 1.75 1.38 1.65 1.55 2.10 1.95 1.65 1.88 2.00