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| Teaching Since: | May 2017 |
| Last Sign in: | 409 Weeks Ago |
| Questions Answered: | 66690 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Arsenic in groundwater. Refer to the Environmental Science and Technology (January 2005) study of the reliability of a commercial kit to test for arsenic in groundwater, Exercise 4.12 (p. 187). Recall that you fit a first-order model for arsenic level (y) as a function of latitude (x1), longitude (x2), and depth (x3) to data saved in the ASWELLS file. Check the assumption of a constant error variance by plotting the model residuals against predicted arsenic level. Interpret the results.
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