Concept explainers
Arsenic in groundwater. Environmental Science & Technology (January 2005) reported on a study of the reliability of a commercial kit to test for arsenic in groundwater. The field kit was used to test a sample of 328 groundwater wells in Bangladesh. In addition to the arsenic level (micrograms per liter), the latitude (degrees), longitude (degrees), and depth (feet) of each well were measured. The data are saved in the file. (The first and last 5 observations are listed in the table below.)
a. Write a first-order model for arsenic level (y) as a
b. Fit the model to the data using the method of least squares.
C Give practical interpretations of the β estimates.
d. Find the model standard deviation, s, and interpret its value.
e. Find and interpret the values of R2 and
f. conduct a test of overall model utility at α =.05.
g. Based on the results, parts d-f, would you recommend using the model to predict arsenic level (y)? Explain.
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Statistics for Business and Economics (13th Edition)
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