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 σ2. 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

Transcribed Image Text:

42 46 40 49 48 44 830 895 825 890 890 910 43 46 53 | 52 1010 | 1012 57 58 54 1030 x| 915 990 960 1050