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Which of the following threats to internal validity can occur in any study?
Nonsystematic Variance
The portion of an investment's total variance that is specific to the investment itself, not related to the overall market movements, and can be reduced by diversification.
Market Index
A statistical measure that represents the value of a section of the stock market, compiled from the prices of selected stocks to gauge market trends or portfolio performance.
Active Portfolio
An investment portfolio that is actively managed with the goal of achieving returns that outperform a specific benchmark or market index.
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