Use this scenario for sleep study questions. In may 2020, 1864 students responded to a campus-wide qualtrics survey. Of the 1864 students, 934 said they had trouble falling asleep at night, but the rest did not. Of the 934 who said they had trouble sleeping at night, 695 drank some type of caffeinated beverage after 5pm most days. Of those who reported no trouble falling asleep at night, 291 said they drank some type of caffeinated beverage after 5pm most days. What type of study design is this? How can you tell