Project: This project can be done in groups or as

Chapter 11, Problem 11.68

(choose chapter or problem)

Project: This project can be done in groups or as individuals. Each group or person must nd a set of data, preferably but not restricted to their eld of study. The data need to t the regression framework with a regression variable x and a response variable y. Carefully make the assignment as to which variable is x and which y. It may be necessary to consult a journal or periodical from your eld if you do not have other research data available. (a) Plot y versus x. Comment on the relationship as seen from the plot. (b) Fit an appropriate regression model from the data. Use simple linear regression or t a polynomial model to the data. Comment on measures of quality. (c) Plot residuals as illustrated in the text. Check possible violation of assumptions. Show graphically a plot of condence intervals on a mean response plotted against x. Comment.