Exercise

# The factorial ANOVA

Now that you have tested the homogeneity of variance assumption, it is time to run the factorial ANOVA using the following notation:

```
aov(dependent_variable ~ independent_var1 * independent_var2)
```

The multiplication symbol in the formula ensures that both the main effect of the two independent variables as well as their interaction effect are taken into account in the ANOVA analysis.

Instructions

**100 XP**

- Use the function
`aov()`

to perform a factorial ANOVA on`ab`

. Assign the result to`ab_model`

. - Apply the
`summary()`

function to`ab_model`

to get the ANOVA summary table. Study the table closely.