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) Te data read from a graph) are shown as follows:, , , , (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., Happened

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