The processing of raw coal involves washing, in which coal ash (nonorganic, incombustible material) is removed. The
Question:
a. Compute the least-squares line for predicting percent ash (y) from volume (x). Plot the residuals versus the fitted values. Does the linear model seem appropriate? Explain.
b. Compute the least-squares line for predicting percent ash from ln volume. Plot the residuals versus the fitted values. Does the linear model seem appropriate? Explain.
c. Compute the least-squares line for predicting percent ash fromvolume. Plot the residuals versus the fitted values. Does the linear model seem appropriate? Explain.
d. Using the most appropriate model, predict the percent ash for particles with a volume of 50 m3.
e. Using the most appropriate model, construct a 95% confidence interval for the mean percent ash for particles with a volume of 50 m3.
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