Question

Identify the independent variable : The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead.
PsyDAG
An <B>independent variable</B> is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable.

A <B>dependent variable</B> is the response or measure of results.

Which is the potential cause, and which measures the results?
mad
the independent variable is the amount of pollution produced

and the dependent variable was gasoline containing different lead