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An experimental researcher selects students to participate in a study examining the influence of a ...

An experimental researcher selects students to participate in a study examining the influence of a new math curriculum in an elementary school grade. The researcher randomly assigns the students to the new curriculum or a control group. However, some other events focusing on math may occur outside the classroom. What potential threat to validity exists in this experiment?
A) History
B) Selection
C) Regression
D) Ability scores

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