The article “Chemithermomechanical Pulp from Mixed High Density Hardwoods” (TAPPI, July 1988: 145–146) reports on a study in which the accompanying data was obtained to relate y = specific surface area (cm2/g) to x1 = % NaOH used as a pretreatment chemical and x2 = treatment time (min) for a batch of pulp.
The accompanying Minitab output resulted from a request to fit the model
a. What proportion of observed variation in specific surface area can be explained by the model relationship?
b. Does the chosen model appear to specify a useful relationship between the dependent variable and the predictors?
c. Provided that % NaOH remains in the model, would you suggest that the predictor treatment time be eliminated?
d. Calculate a 95% CI for the expected change in specific surface area associated with an increase of 1% in NaOH when reatment time is held fixed.
e. Minitab reported that the estimated standard deviation of is .162. Calculate a prediction interval for the value of specific surface area to be observed when % NaOH = 9 and treatment time = 60.
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