ate Std. Error t value Pr(&gt;|t|)    
## (Intercept)  49.9308     4.2113  11.856 1.21e-12 ***
## wt          -13.3803     2.5140  -5.322 1.04e-05 ***
## I(wt^2)       1.1711     0.3594   3.258  0.00286 ** 
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 2.651 on 29 degrees of freedom
## Multiple R-squared:  0.8191, Adjusted R-squared:  0.8066 
## F-statistic: 65.64 on 2 and 29 DF,  p-value: 1.715e-11</code></pre>
<p>Looking only at the regression res