Consider the data in Exercise 11-7 on y green liquor Na2S concentration and x paper
Chapter 11, Problem 11-62(choose chapter or problem)
Consider the data in Exercise 11-7 on y green liquor Na2S concentration and x paper machine production. Suppose that a 14th sample point is added to the original data, where y14 59 and x14 855. (a) Prepare a scatter diagram of y versus x. Fit the simple linear regression model to all 14 observations. (b) Test for significance of regression with 0.05. (c) Estimate 2 for this model. (d) Compare the estimate of 2 obtained in part (c) above with the estimate of 2 obtained from the original 13 points. Which estimate is larger and why? (e) Compute the residuals for this model. Does the value of e14 appear unusual? (f) Prepare and interpret a normal probability plot of the residuals. (g) Plot the residuals versus and versus x. Comment on these graphs. 11-
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