Data exploration with a barplot

The dataset introduced in the previous exercise is loaded in your workspace under the name ab. Have a look at the dataset by typing head(ab) in the console. You should observe the following variables in the dataset:

subject: unique identifier for each subject
conversation: level of conversation difficulty
driving : level of driving difficulty in the simulator
errors: number of driving errors made

Use the tapply() function to create the 6 subgroups and assign the result to ab_groups. The code is provided for you, but take a few seconds to understand what it does.
Replicate the barplot displayed using the barplot() function. Check out ?boxplot to get a feeling for how it works. The colors used are "orange" and "blue". Make sure to include the legend and check the hint if you need some extra support!

Exercise

Data exploration with a barplot

Instructions