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</h3>
<ul>
<li>Calculate descriptive statistics (mean and SD) for <code>interest</code> for each <code>Condition</code> for each <code>time</code> (hint: you will need to <code><a href="https://dplyr.tidyverse.org/reference/group_by.html">group_by()</a></code> two variables) and store it in an object named <code>sum_dat_factorial</code>. These are known as the cells means.</li>
</ul>
</div>
<div id="factorial-a3" class="section level3" 