Identify the independent variable : The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead.

Answer 1

An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable.

A dependent variable is the response or measure of results.

Which is the potential cause, and which measures the results?

Answer 2

the independent variable is the amount of pollution produced

and the dependent variable was gasoline containing different lead