Question 15 Notyet answered Marked out of 5.00 P Flag question Respondent Age (in years) is added to the regression model in two different ways. lm15a=lm( Politicalscale SocialClass+ Age) summary (lm15a) lm15b=lm( PoliticalScale SocialClass Age) anova (lm15a,lm15b) (a) What does the coefficient of Age in the first analysis ( Im15a) tell you about how people view themselves on a political scale ? [ 2 marks ] (b) What, in terms of the shape of a graph of fitted values vs Age, would be the difference between the two models Im15a and Im15b ? [ 2 marks ] (c) What do we conclude from the anova( Im15a,Im15b) test? [1 mark ]