ifference in proportions = 0 </span></span>
<span><span class="co">##  Ha: Difference in proportions != 0 </span></span>
<span><span class="co">##  Z = 3.55 </span></span>
<span><span class="co">##  p.value = 0.000383</span></span></code></pre>
<p>The <code>proptesti</code> function is analogous to
<code>ttesti</code> described above - rather than providing data
vectors, we can provide summary statistics in the form of counts of
successes out of a total number of trials. Here we test whether the
proportion 