e="list-style-type: decimal">
<li>The DV is interval or ratio data</li>
<li>The observations should be independent</li>
<li>The residuals should be normally distributed</li>
<li>There should be homogeneity of variance between the groups</li>
</ol>
<p>As before, we know assumption 2 is met from the design of the study. Assumption 1 throws up an interesting issue which is the problem of ordinal data. Ordinal data are the kind of data that come from Likert scales and are very common in psychology. The problem 