Evaluate the expression. 
Definitions:
Independent Variable
The variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.
Confounding Variable
An external variable that affects both the variables being studied, potentially misleading the results of an experiment.
Teaching Method
The systematic way or strategy used by educators to facilitate learning among students.
Confounding Variable
A factor other than the independent variable that might produce an effect in an experimental study, potentially misleading the results.
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