The volume of oxygen consumed (in liters per minute) while a person is at rest and while a person is exercising (running on a treadmill) were both measured for 50 subjects. The goal is to determine if the volume of oxygen consumed during aerobic exercise can be estimated from the amount consumed at rest. The results are plotted below. 
In this study, the explanatory variable is:
Definitions:
Instrumental Support
A type of social support involving practical or material help, such as providing resources or assistance in completing tasks.
Empathy
The ability to understand and share the feelings of another, a crucial component of emotional intelligence and human connection.
Infatuation
A state of intense, often short-lived passion or admiration for someone or something.
In-group Bias
The tendency for people to give preferential treatment and exhibit more positive attitudes towards members of their own group over those of an out-group.
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