Data set moved

I have moved the data set to https://www.dropbox.com/scl/fi/eq5dmgub3zh160392o6cy/data.zip?rlkey=xmf1q6a5rc2zbyyji0xi3yaxu&st=d1hd0wh7&dl=1

Now the data will all come together in a data ZIP file. Update the course materials to reflect this.