Exercise

# ANOVA test

In this exercise, we'll run the ANOVA test and analyze its outcome. Execute the code now and investigate the output.

Let’s examine the output: First, we have a numerical response variable (score on vocabulary test) and a categorical explanatory variable (*class*). Since *class* has four levels, comparing average scores across the levels of the *class* variable requires ANOVA.

Before we get to the ANOVA output we are presented with a series of summary statistics and the associated hypotheses.

Note that the `alternative`

hypothesis is set to `greater`

because F-tests are always onesided.

Instructions

**100 XP**

Run the code and carefully read the exercise to examine the ANOVA output.