hat checks were performed.</p>
<hr />
</div>
</div>
</div>
<div id="exercise-3" class="section level1">
<h1>Exercise 3</h1>
<div id="exercise-3a" class="section level2">
<h2>Exercise 3a</h2>
<p>We now show how the data mistakes can be fixed, one by one. Since we advice that this is done in a self contained R-script, we will provide the answers as a commented chunk of R code. Note that we correct <em>all</em> errors, some of which you might not (yet) be aware of.</p>
<pre class="r"><code>#Load packages
libra