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Imagine a hypothetical study using a nonequivalent comparison group designed to assess the effectiveness of an anti-drug, "Just Say No," campaign. In this study students at school X receive a semester-long series of "Just Say No" lectures. Students at school Y across town do not receive the intervention. Unfortunately, during the semester a student at school Y died after an accidental drug overdose. This incident may have influenced drug use at school Y but not school X) and consequently make it impossible to interpret our research findings. Which of the following threats to internal validity is present in this study?
Big Raise
A substantial increase in salary or wages, typically awarded to an employee as a recognition of exceptional performance or achievement.
Atomic Components
The fundamental units or simplest terms in a logical expression or statement that cannot be broken down further.
Symbolic Notation
The use of symbols to represent numbers, operations, relations, or concepts to simplify the expression of mathematical, logical, or scientific ideas.
Atomic Components
Fundamental parts or particles that constitute an atom, such as electrons, protons, and neutrons.
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