The main difference between internal validity and external validity is that:

Question

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Internal validity refers to the degree to which an experiment supports clear causal conclusions. It reflects the degree to which the design and conduct of an experiment ensures that any changes in the dependent variable (outcome) can be attributed to the independent variable (treatment). External validity, on the other hand, reflects the extent to which the results of a study can be generalized to other populations, settings, and situations. It concerns the generalizability of the findings to the broader population under different conditions. Therefore, the best answer is B.

The Main Difference Between Internal Validity and External Validity Is