Wauchope and McDowell (1984) studied the effect of the amount of extractable iron, the amount of extractable aluminium and the pH of soils' adsorption of phosphate to the adsorption index. Table below gives the data: Extractable Iron Adsorption Index Extractable pH Aluminium 61 13 7.7 4 175 21 7.7 18 111 24 6.8 14 124 23 7.3 18 130 64 5.1 26 173 38 5.7 26 169 33 5.8 21 169 61 5.2 30 160 39 6.3 28 244 71 5.7 36 257 112 4.4 65 333 88 4.5 62 199 54 6.2 40 (a) Fit a multiple regression model for predicting adsorption index using the amount of extractable iron, the amount of extractable aluminium and the pH of soils' adsorption of phosphate by using EXCEL/SPSS. (b) Perform the model utility test by using 0.05 significance level. (e) Interpret the values of R° given in the output. (d) Determine whether the amount of extractable iron contributes significantly to the regression after effects of the amount of extractable aluminium and effects of the pH of soils' adsorption of phosphate are taken into account.

Wauchope and McDowell (1984) studied the effect of the amount of extractable iron, the amount of extractable aluminium and the pH of soils' adsorption of phosphate to the adsorption index. Table below gives the data: Extractable Iron Adsorption Index Extractable pH Aluminium 61 13 7.7 4 175 21 7.7 18 111 24 6.8 14 124 23 7.3 18 130 64 5.1 26 173 38 5.7 26 169 33 5.8 21 169 61 5.2 30 160 39 6.3 28 244 71 5.7 36 257 112 4.4 65 333 88 4.5 62 199 54 6.2 40 (a) Fit a multiple regression model for predicting adsorption index using the amount of extractable iron, the amount of extractable aluminium and the pH of soils' adsorption of phosphate by using EXCEL/SPSS. (b) Perform the model utility test by using 0.05 significance level. (e) Interpret the values of R° given in the output. (d) Determine whether the amount of extractable iron contributes significantly to the regression after effects of the amount of extractable aluminium and effects of the pH of soils' adsorption of phosphate are taken into account.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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