Rock: 80
Pop: 72
Rap: 38
What kind of chi-square is this, and how many degrees of freedom are there?

Question

Quizplus · Accepted Answer

This is a goodness of fit test because it involves comparing observed frequencies (of music genre preferences, in this case) to expected frequencies under a specific hypothesis. The degrees of freedom for a chi-square goodness of fit test are calculated as the number of categories minus one. Here, there are 3 categories (Rock, Pop, Rap), so the degrees of freedom are 3 - 1 = 2.

Rock: 80 Pop: 72