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A nursing student is reviewing a research study in which researchers used pretest/posttest design to examine the effect of an AIDS education intervention on teenagers' knowledge level over a school year.What threats to internal validity could be present? (Select all that apply.)
Wage Differential
The difference in wages earned by workers in different jobs, sectors, or locations, often influenced by factors like skill levels, demand, and living costs.
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Consumer Preferences
The subjective tastes and desires that dictate the choices a consumer makes among different products and services.
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Academic professionals specializing in finance theory, financial market analysis, and investment strategies.
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