2. A data set on ozone can be downloaded from http://www-statstanford.edu/"tibs/ElemStatLearn/. Let Y denote the ozone concentration level (given in the 1st column), Xl denote radiation (given in the 2nd column), X2 denote temperature (given in the 3rd column), and X3 denote Wind speed (given in the 4th column). (a) Obtain the kernel regression fit to measurements of (X1,Y) (b Obtain the kernel regression fit to measurements of (X2, Y). ,Y) Go ) (c) Obtain the kernel regression fit to measurements of (X ) (d Interpret the results obtained in parts (a), (b), and