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ecause researchers are generally more concerned with establishing internal validity rather than external validity, they are typically more concerned with _________ and less concerned with ____________.

Answer :

Adematae

Answer:

Random assignment;

Random selection

Explanation:

Random assignment is a technique for placing subject into the different groups so that the characterstics of the sample can be equally distributed while Random Selection is how we select individuals from the population to participate in study.

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