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1.3: Threats to Internal Validity and Different Control Techniques
https://stats.libretexts.org/Courses/Kansas_State_University/EDCEP_917%3A_Experimental_Design_(Yang)/01%3A_Introduction_to_Research_Designs/1.03%3A_Threats_to_Internal_Validity
With that, the only difference between the two groups is the condition participants are assigned to, which is the independent variable, then we are confident to infer that the independent variable act...With that, the only difference between the two groups is the condition participants are assigned to, which is the independent variable, then we are confident to infer that the independent variable actually causes the differences in the dependent variables.

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