_____ is about making sure experimental and control groups are equivalent, and _____ is about selecting participants from a population so that the selected group is representative of that population.

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Random assignment is about assigning participants randomly to experimental and control groups to ensure equivalence between the groups, hence addressing internal validity. On the other hand, random sampling is about selecting participants randomly from the population to ensure that the sample is representative of that population, thus addressing external validity.

_____ Is About Making Sure Experimental and Control Groups Are