A sociologist studying freshmen carried out a survey, asking (among other questions) how often students went out per week, how many hours they studied per day, and how many hours they slept at night. The table below provides the answers on the time slept and the time spent studying. Did students who studied 3 or more hours sleep less?
A)Yes, because if someone studies more they have less time to sleep.
B)No, because students who study more party less.
C)Yes, because the proportion of students who slept at most 8 hours among those studying 3 hours or more is 0.73, while the proportion who slept at most 8 hours among those studying less than 3 hours is 0.769.
D)There is not enough information to answer this question.

Question

A sociologist studying freshmen carried out a survey, asking (among other questions) how often students went out per week, how many hours they studied per day, and how many hours they slept at night. The table below provides the answers on the time slept and the time spent studying.  Did students who studied 3 or more hours sleep less?
A)Yes, because if someone studies more they have less time to sleep. 
B)No, because students who study more party less. 
C)Yes, because the proportion of students who slept at most 8 hours among those studying 3 hours or more is 0.73, while the proportion who slept at most 8 hours among those studying less than 3 hours is 0.769. 
D)There is not enough information to answer this question.

Quizplus · Accepted Answer

The table shows that among students who study for 3 or more hours per day, 73% of them slept for at most 8 hours per night. On the other hand, among students who study for less than 3 hours per day, 76.9% of them slept for at most 8 hours per night. This means that, on average, students who study for 3 or more hours per day sleep slightly less than those who study for less than 3 hours per day. Therefore, choice C is correct. Choice A is incorrect because it only presents a general assumption without any evidence or data from the survey. Choice B is also unsupported by the data and makes assumptions about the behavior of students who study more. Choice D is incorrect because the data in the table provide sufficient evidence to answer the question.

A Sociologist Studying Freshmen Carried Out a Survey, Asking (Among