CC3 7.3.3 7-111
Researchers have determined that teenagers’ memories are negatively affected by getting less than 10 hours of sleep. Being good scientists, the math students at North Middle School were skeptical, so they did their own study. They asked 10 students to memorize objects. The next day, each student was asked how much sleep they got and then was asked to list the ten items.

Make a conditional relative frequency table to determine if there’s an association between hours of sleep and memory