16. The data in Exercise 15 were fitted to a linear model without the quadratic term with the results that follow.

a. What can you say about the contribution of the quadratic term when it is included in the model?

b. The plot of the residuals from the linear regression model shows a specific pattern. What is the term in the model that seems to be missing?

Transcribed Image Text:

SUMMARY OUTPUT Regression Statistics Multiple R 0.9645 R Square 0.9303 Adjusted R Square 0.9187 Standard Error 0.3311 Observations 8