In an experimental study,external validity refers to the

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External validity refers to the extent to which the experimental design reflects the real-world issues it explores, meaning how applicable the findings are to the broader population outside of the experiment. It is concerned with the generalizability of the results and whether they can be applied in other settings or to other populations. Therefore, option D is the correct answer. Option A is incorrect because external validity is not concerned with whether the results can improve human life, but with whether the results can be applied to other contexts. Option B is incorrect because experimenter bias is a form of internal validity, which refers to the extent to which the experiment establishes a causal relationship between variables. Finally, option C is incorrect because replication is a matter of reliability rather than external validity.

In an Experimental Study,external Validity Refers to the