Question

1.15 gpa and study hours: a survey was conducted on 193 duke university undergraduates who took an introductory statistics course in 2012. among many other questions, this survey asked them about their gpa, which can range between 0 and 4 points, and the number of hours they spent studying per week. the scatter - plot below displays the relationship between these two variables.
a) what is the explanatory variable?
number of study hours per week
gpa
b) what is the response variable?

Explanation:

In a relationship between two variables, the explanatory variable is the one thought to influence or explain changes in the other variable. Here, the number of study hours per week is likely to influence GPA. The response variable is the one that is being studied and is expected to change in response to the explanatory variable, which is GPA in this case.

Answer:

a) number of study hours per week
b) GPA