OBS              ID        SEX        AGE            INC       
 Min.   : 1.00   Min.   : 1.00   F:5   Min.   :24.0   Min.   : 6.00  
 1st Qu.: 3.25   1st Qu.:17.25   M:5   1st Qu.:34.0   1st Qu.: 9.50  
 Median : 5.50   Median :33.50         Median :40.0   Median :14.00  
 Mean   : 5.50   Mean   :35.00         Mean   :38.3   Mean   :12.50  
 3rd Qu.: 7.75   3rd Qu.:49.75         3rd Qu.:45.0   3rd Qu.:16.25  
 Max.   :10.00   Max.   :81.00         Max.   :52.0   Max.   :17.00  
       R1             R2            R3     
 Min.   :4.00   Min.   :2.0   Min.   :2.0  
 1st Qu.:5.25   1st Qu.:5.0   1st Qu.:3.0  
 Median :6.50   Median :5.0   Median :5.5  
 Mean   :6.10   Mean   :5.0   Mean   :4.9  
 3rd Qu.:7.00   3rd Qu.:6.5   3rd Qu.:7.0  
 Max.   :7.00   Max.   :7.0   Max.   :7.0  

Call:
lm(formula = INC ~ AGE, data = survey)

Residuals:
    Min      1Q  Median      3Q     Max 
-4.2107 -2.6361  0.9852  2.0809  3.0307 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)    
(Intercept)  25.5866     4.3569   5.873 0.000373 ***
AGE          -0.3417     0.1109  -3.082 0.015074 *  
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 3.085 on 8 degrees of freedom
Multiple R-squared:  0.5428,	Adjusted R-squared:  0.4857 
F-statistic: 9.498 on 1 and 8 DF,  p-value: 0.01507