Exercise

# Groups and subjects

By performing a `leveneTest()`

, you can check whether or not the homogeneity of variance assumption holds for a given dataset. The assumption must hold for the results of an ANOVA analysis to be valid.

Recall from the first chapter that ANOVA makes use of F-statistics, or F-ratios, in which two types of degrees of freedom are involved. These degrees of freedom are defined as

$$df_a = a - 1$$

$$df_{s/a} = a(n - 1)$$

where the values \(a\) and \(n\) represent the number of groups and the number of subjects in each group, respectively.

Can you tell based on the output from `leveneTest()`

how many groups and how many subjects are involved in our experiment?

Instructions

**50 XP**

##### Possible Answers

- There are 5 groups and 114 subjects.
- There are 5 groups and 120 subjects.
- There are 6 groups and 114 subjects.
- There are 6 groups and 120 subjects.