class="op">)</span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>             Df Sum Sq Mean Sq F value  Pr(&gt;F)   </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> tire         3   5673  1891.0   5.328 0.00732 **</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Residuals   20   7099   354.9                   </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> ---</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Signif. codes:  0 ‘***’ 