: true mean difference is not equal to 0</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 95 percent confidence interval:</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  -8.552864 -1.447136</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> sample estimates:</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> mean difference </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>              -5 </span>
<span class="r-out co"><span class="r-pr">#&gt;</