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+#Exercise 2
+
+#a) 
+pickup=read.csv("pickup.csv",header=TRUE)
+attach(pickup)
+plot(pickup)
+
+#b)
+#linear model
+linearmodel=lm(log(price)~.,data=pickup)
+summary(linearmodel)
+
+#model diagnostics
+plot(linearmodel)
+
+#c)
+#adding interaction terms
+linearmodel2=lm(log(price)~year+miles+make+make*miles+make*year,data=pickup)
+summary(linearmodel2)
+
+plot(linearmodel2)
+