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[All Steps] Arsenic in groundwater. Refer to the Environmental Sci ence Technology (Jan. 2005) study of the reliability of a commercial kit to test for

Question: Arsenic in groundwater. Refer to the Environmental Sci ence & Technology (Jan. 2005) study of the reliability of a commercial kit to test for arsenic in groundwater, Exercise 11.20 (p. 526). Recall that you fit a first-order model for arsenic level (y) as a function of latitude, longitude, and depth to the data saved in the ASWELLS file. Conduct a complete residual analysis of the model. Do you recommend any model modifications?

ASWELLS

(Data for first and last five wells shown)

Well Latitude Longitude Depth Arsenic
10 23.7887 90.6522 60 331
14 23.7886 90.6523 45 302
30 23.78 90.6517 45 193
59 23.7893 90.6525 125 232
85 23.7920 90.6140 150 19
7353 23.7949 90.6515 40 48
7357 23.7955 90.6515 30 172
7890 23.7658 . 90.6312 60 175
7893 23.7656 90.6315 45 624
7970 23.7644 90.6303 30 254

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Solution: The downloadable solution consists of 3 pages
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