6. Consider the experiment to study factors that a ect the percent removal of arsenic from drinking...
Question:
6. Consider the experiment to study factors that a ect the percent removal of arsenic from drinking water using a iron coated sand lter.
(a) Modify the SAS code in Section 6.5.1 to produce the design shown in Table 6.8
(b) Determine the de ning relation for the experiments in the rst block and show the confounding of main e ects with strings of two-factor in-
teractions.
(c) Calculate the e ects and make a half-normal plot of them using only the data from block 1 in Table 6.8.
(d) Determine the de ning relation for the combined experiments.
(e) Calculate the e ects, including the block e ect, and make a half-normal plot of them using all the data in Table 6.8. What interactions are con-
founded with the block e ect?
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