Dr$.$ Thompson wanted to evaluate whether students who have recently slept $7$ or more hours in the past $24$ hours are better at memory recall and studying focus than those who did not recently get sleep. Dr$.$ Thompson asks students to come to Cooper Library in the evening between $6-8$ pm$.$ Every student answers "yes" or $"$no$"$ as to whether they have slept $7$ or more hours within the past $24$ hours and are placed into an "Sleep" or "Non$-$Sleep" group. Every student in either condition is placed in a small cubicle that only contains $1$ IPAD and a pair of headphones; all aspects of that cubicle $($color of walls, no decor, type of chair, temperature etc$)$ are identical no matter what condition you are in$.$ Students receive the same memory recall test which contains the same string of letters and characters for them to recall $60$ seconds later $($memory recall is number of correctly recalled letters$/$characters$).$ Dr Thompson finds that the sleep group has a higher average memory recall score compared to the non$-$sleep group.