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Which of the following is an extremely important design element to have in an experimental study Check all that

Which of the following is an extremely important design element to have in an experimental study? Check all that apply.

1.    1- Treatments that are imposed by the experimenter

2.    2- A placebo

3.    3- Groups which are exactly the same size

4.    4-Randomized selection of participants

Apr 23 2020 View more View Less

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