From Carleton Moodle Docs
If statistics are enabled for the site, graphs and tables of user activity may be generated.
The statistics graphs and tables show how many hits there have been on various parts of your site during various time frames. They do not show how many distinct users there have been. They are processed daily at a time you specify. You must enable statistics before you will see anything.
A manager, teacher or non-editing teacher (or any other user with the capability (report/stats:view) can view statistics for their course in Administration > Course administration > Reports > Statistics.