* Tread Life Of Tires(in Miles);

data tires;

label location='tire location'

      old='the old rubber formation'

      new='the new rubber formation';



car location$ old       new 

-------------------------------

1   front    37661      31902 

1   rear     42342      41203 

2   front    31108      38816 

2   rear     41239      43305 

3   front    32903      35375 

3   rear     42658      52353 

4   front    29829      30883 

4   rear     39616      49424 

5   front    34625      38724 

5   rear     42650      43234 

6   front    31923      34565 

6   rear     39990      43861