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A researcher pretests a group of subjects on their eighth-grade math skills, and then teaches them...

A researcher pretests a group of subjects on their eighth-grade math skills, and then teaches them (the treatment) a new way to solve simple equations. The posttest is administered, and there is an increase in the number of correct answers. What's the most likely threat to internal validity here?

History

Maturation

Regression

Testing

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Answer #1

Answer : Maturation

As the students are taught they also become mature over time and get to know about how to solve such questions.

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