Question: An engineer studied the effect of four variables on a dimensionless factor used to describe pressure drops in a screen - plate bubble column. Table

An engineer studied the effect of four variables on a dimensionless factor used to describe pressure drops in a screen - plate bubble column. Table B.9 summarizes the experimental results.

a. Fit a multiple linear regression model relating this dimensionless number to these regressors.

b. Test for signifi cance of regression. What conclusions can you draw?

c. Use t tests to assess the contribution of each regressor to the model.

Discuss your fi ndings.

d. Calculate R2 and RAdj 2 for this model. Compare these values to the R2 and RAdj 2 for the multiple linear regression model relating the dimensionless number to x2 and x3 . Discuss your results.

e. Find a 99% CI for the regression coeffi cient for x2 for both models in part

d. Discuss any differences.

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