An article in the Tappi Journal (March, 1986) presented data on green liquor Na2S
Chapter 11, Problem 11-7(choose chapter or problem)
An article in the Tappi Journal (March, 1986) presented data on green liquor Na2S concentration (in grams per liter) and paper machine production (in tons per day). The data (read from a graph) are shown as follows: y 40 42 49 46 44 48 x 825 830 890 895 890 910 y 46 43 53 52 54 57 58 x 915 960 990 1010 1012 1030 1050 (a) Fit a simple linear regression model with y green liquor Na2S concentration and x production. Find an estimate of 2 . Draw a scatter diagram of the data and the resulting least squares fitted model. (b) Find the fitted value of y corresponding to x 910 and the associated residual. (c) Find the mean green liquor Na2S concentration when the production rate is 950 tons per day. 1
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