> summary(pa1)

Call:
lm(formula = Y ~ POP + IMP + NLIC + INGRESO + ROAD + FUEL + LIC)

Residuals:
     Min       1Q   Median       3Q      Max 
-117.443  -41.894   -7.102   30.760  208.131 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept) 147.78947  191.76201   0.771   0.4454    
POP           0.05858    0.02667   2.196   0.0340 *  
IMP         -32.71658   12.23714  -2.674   0.0108 *  
NLIC         -0.20100    0.07516  -2.674   0.0108 *  
INGRESO     -45.11003   21.81742  -2.068   0.0452 *  
ROAD         -5.49001    5.44200  -1.009   0.3191    
FUEL          0.10360    0.04421   2.343   0.0242 *  
LIC          15.63036    2.73253   5.720 1.17e-06 ***
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Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1