A teacher sends students an anonymous survey in order to learn more about the students' work habits. The survey contains the following questions.
On average, how long does homework take you each night (in minutes) ?
On average, how long do you study for each test (in minutes) ?
Do you enjoy the subject material of this class (yes or no) ?
Which of the following questions about the students who responded to the survey can the teacher answer by analyzing the survey results?
Do students who enjoy the subject material tend to spend more time on homework each night than the other students do?
Do students who spend more time on homework each night tend to spend less time studying for tests than the other students do?
Do students who spend more time studying for tests tend to earn higher grades in the class than the other students do?
