Snowpacks contain a wide spectrum of pollutants that may represent environmental hazards. The article "Atmospheric PAH Deposition: Deposition Velocities and Washout Ratios" (J. of Environmental Engineering, 2002: 186-195) focused on the deposition of polyaromatic hydrocarbons. The authors proposed a multiple regression model for relating deposition over a specified time period (y, in mg/m2) to two rather complicated predictors x1 (mg-sec/m3) and x2 (mg/m2), defined in terms of PAH air concentrations for various species, total time, and total amount of precipitation. Here is data on the species fluoranthene and corresponding Minitab output:

The regression equation is
flth = - 33.5 + 0.00205 x1 + 29836 x2

S = 44.28 R-Sq = 92.3% R-Sq(adj) = 91.2%
Analysis of Variance

Formulate questions and perform appropriate analyses to draw conclusions.

Transcribed Image Text:

flth 278.78 124.53 22.65 28.68 obs 92017 51830 17236 15776 0026900 0030000 0000196 0000360 0004960 0038900 0011200 0006400 0004850 0003660 0002290 0014100 0004100 0000960 0000896 0026000 0009530 1 243500 67793 23471 13948 8824 7699 15791 10239 43835 49793 604.70 27.69 14.18 20.64 20.60 16.61 15.08 18.05 99.71 58.97 72.58 44.25 10 12 13 14 15 16 17 50774 TP Predictor Constant xl x2 Coef 33.46 SE Coef 14.90 -2.25 0.041 0.0020548 0.0002945 6.98 0.000 2.19 0.046 29836 13654 MS Source Regression Residual Error 14 27454 Total DE 8 2 330989 165495 84.390.000 2 1961 16 358443