In an experimental design, if your groups are different prior to the intervention, then you may have ________________.
A) testing threat
B) attrition threat
C) regression to the mean
D) selection bias

Name: In an experimental design, if your groups are different prior to the intervention, then you may have ________________. A) testing threat B) attrition threat C) regression to the mean D) selection bias
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The Answer is D

In an Experimental Design, If Your Groups Are Different Prior