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I Selected My 7th Grade Classmates as the Control Group

Question 51

Multiple Choice

I selected my 7th grade classmates as the control group and a group of 7th graders from another school as the treatment group. What bias has a good chance of impacting this study?


A) bias due to history
B) the posttest-only control-group design
C) bias due to maturation
D) biased selection

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