1. Compare independent variables dependent variables and extraneous variables. Describe two ways that researchers attempt to control extraneous variables. Support

1.
Compare independent variables, dependent variables, and extraneous variables. Describe two ways that researchers attempt to control extraneous variables. Support your answer with peer-reviewed articles. 2 references
2. Describe the levels of evidence and provide an example of the type of practice change that could result from each. 2 references
NB.find attached file and used

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