ternative hypothesis: true mean is less than 80</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>      -Inf 78.79436</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 of x </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>      74.4 </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> <