OpenIntro features a number of free books that can be used in high school and AP statistics courses. The license on these datasets is currently unknown. You can find out more about OpenIntro at https://www.openintro.org.
The National Sleep Foundation conducted a survey on the sleep habits ofrandomly sampled transportation workers and a control sample ofnon-transportation workers.
sleep - a factor with levels <6, 6-8, and >8
profession - a factor with levels bus / taxi / limo drivers, control, pilots, train operators, truck drivers