Please solve it by R.

Question 2 (15 points): Analyze and interpret the effect of explanatory variables on the milk intake (dl.milk) in the kfi data set (ISwR) using a multiple regression model. Test by using a= .05. (a) Run regression for dl.milk on all other variables (sex, weight, ml.supply matweight, matheight). Do you find any significance that milk intake can be explained by other variables? (b) Find regression models in which fewer explanation variables should be used. i.e., select a subset of variables so that a better fit can be achieved. (Choose whatever criteria you like)