summary(mod)

#> Call:
#> lm(formula = concentratie ~ piekoppervlakte, data = kalibratie)

#> Residuals:
#>         1         2         3         4         5 
#> -0.001177  0.002481 -0.005562  0.006894 -0.002636 

#> Coefficients:
#>                   Estimate Std. Error t value Pr(>|t|)    
#> (Intercept)     -1.690e-02  5.061e-03   -3.34   0.0444 *  
#> piekoppervlakte  2.397e-05  4.565e-07   52.51 1.52e-05 ***
#> ---
#> Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
#> 
#> Residual standard error: 0.005566 on 3 degrees of freedom
#> Multiple R-squared:  0.9989,	Adjusted R-squared:  0.9986 
#> F-statistic:  2757 on 1 and 3 DF,  p-value: 1.521e-05