Compare independent variables, dependent variables, and extraneous variables. Describe two ways that researchers attempt to contro

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. 400 words references within 5 years,

2, Describe the seven “levels of evidence” and provide an example of the type of practice change that could result from each. 400 words reference within 5 years