A magazine 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 20 groundwater wells in a country. In addition to the arsenic level (micrograms per liter), the latitude (degrees), longitude (degrees), and depth (feet) of each well was measured. Complete parts a through g. Click the icon to view the data table. a. Write a first-order model for arsenic level (y) as a function of latitude, longitude, and depth. Choose the correct answer below. A. E(y) = B3X1 + B2x2 + B1X3 O B. E(y) = B,xy + B2X2 + B3×3 C. E(y) Po +B1xq + B2X2 + B3×3 ts O D. E(y) = B3 + B2×1 + B1X2 + Pox×3 b. Fit the model to the data using the method of least squares. Let x, be the latitudes, X, be the longitudes, and x, be the depths. SS ns (Round the constant term and the coefficients for x, and x2 to the nearest integer as needed. Round the coefficient for x3 to the nearest hundredth as needed.)

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