Refer to Exercise 14.38.
a. Construct an AOV table for the experiment, and test for the main effects of sludge rate and source of sludge and an interaction between sludge rate and source of sludge.
b. Is there a linear trend in the mean yields across the sludge rates?
c. Which pairs of sludge rates have significant differences in their mean zinc contents?
In exercise

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City A Slhudge Rate 1.0 City B Sludge Rate 1.0 City C Sludge Rate 1.0 0.5 1.5 0.5 1.5 0.5 1.5 26.4 23.5 25.4 22.9 25.2 39.2 25.5 31.9 26.0 44.6 35.5 38.6 30.1 31.0 30.8 32.8 47.7 39.1 55.3 50.7 19.4 19.3 18.7 19.0 23.2 213 23.2 19.9 18.9 19.8 19.6 21.9 68.4 77.1