is that ordinal data aren't interval or ratio data, there's a fixed number of values they can take (the values of the Likert scale) and you can't claim that the distance between the values is equal (is the difference between strongly agree and agree the same as the difference between agree and neutral?).</p>
<p>Technically, we shouldn't use an ANOVA to analyse ordinal data - <em>but almost everyone does</em>. Most people would argue that if there are multiple Likert scale items that are averaged (which is t