* Life of Bulbs;

data bulbs;

label firm='1=Old Supplier 2=New Supplier';



firm life  firm life

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

1     42    2     55

1     46    2     45

1     64    2     58

1     53    2     52

1     38    2     54

1     44    2     47

1     61    2     51

1     44    2     61

1     50    2     49

1     60    2     56

1     39    2     52

1     51    2     49

1     42          

1     37          

1     45          

1     65          

1     54          

1     46          

1     42          

1     44          

1     26          

1     52