Can you please explain these to me. 1.  Intervention fidelity is…

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 Can you please explain these to me.

1.  Intervention fidelity is the process by which the interviewer standardizes the intervention, planning how it will be administered to each subject in the same manner under the same conditions. When studies work to address issues of fidelity they decrease the possibility of bias 

2.  Internal validity is the extent to which an experiment can claim that a specific variable caused the results. A researcher can use these three criteria of manipulation, randomization, and control to minimize bias and decrease threats to internal validity. Randomization is focused on eliminating the effects of unwanted variables to random sampling. With randomization, the experiment can be equally distributed and not generalized for the results

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