Through the first week of the study hall being open. The number of coffee cups left in the sink after 16.00 where counted. The coffee cups represent a single unit of observation. I produced the data and it is free to use for everyone. The coffee cup png is from https://www.nicepng.com/maxp/u2e6t4t4o0r5i1w7/ and can be used for non-commercial use.
