This lesson assumes you have R and RStudio installed on your computer.
The latest version of R can be downloaded here.
RStudio is an application (an integrated development environment or IDE) that facilitates the use of R and offers a number of nice additional features. It can be downloaded here. You will need the free Desktop version for your computer.
Click here to download the zipped dataset. Then you should unzip (and extract on Windows) and move to your Desktop so it is easily accessible.