yi 48 38 41 49 41 41 46 41 46 42 38 39 37 33        
xi 38 41 43 44 40 38 40 41 40 43 40 46 42 44 42 38 49 39
45.6 36.1 39.0 46.6 39.0 39.0 43.7 39.0 43.7 39.9 36.1 37.1 35.2 31.4        
Table 1: PCV levels of Non-Smokers (X) and Smokers (Y).