In the use of randomized controlled designs, as internal validity increases,

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As internal validity increases (through the use of randomized controlled designs), external validity tends to decrease. This is because as experimental control is increased to establish cause-effect relationships, the results become less generalizable to real-world settings. This makes it more difficult to apply the findings of the study to the general population or to other contexts.

In the Use of Randomized Controlled Designs, as Internal Validity