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1. The processing of raw coal involves 'Washing? in which coal ash (nonorganic, incombustible material) is removed. The article 'Quantifying Sampling Precision for Coal Ash Using Gy's Discrete Model of the Fundamental Error\" (Journal of Coal Witty, 19893339) provides data relating the percentage of ash to the volume of a coal particle. The average percentage of ash for six volumes of coal particles was measured. The data are as follows: Volume (cmAS) (1.01 [1.06 (1.58 2.24 15.55 276.02 Percent ash 3.32 4.05 5.69 7.06 8.17 9.36 a. Compute the least-squares line for predicting percent ash from volume. Round the answers to three decimals. Plot the residuals vs. the tted values. Does the linear model seem appropriate? Explain. b. Compute the least-squares line for predicting percent ash from h1(volume). Round the answers to three decimals. Plot the residuals vs. the tted values. Does the linear model seem appropriate? Explain