Reality TV and cosmetic surgery. Refer to the Body Image: An International Journal of Research (March 2010) study of the influence of reality TV shows on one’s desire to undergo cosmetic surgery, Exercise 12.17 (p. 728). Simulated data for the study are saved in the file. In Exercise 12.17, you fit the firstorder model, E1y2 = b0 + b1x1 + b2x2 + b3x3 + b4x4, where y = desire to have cosmetic surgery, x1 is a dummy variable for gender, x2 = level of self@esteem, x3 = level of body satisfaction, and x4 = impression of reality TV.

a. Check the data for multicollinearity. If you detect multicollinearity, what modifications to the model do you recommend?

b. Conduct a complete residual analysis for the model. Do you detect any violations of the assumptions? If so, what modifications to the model do you recommend?