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A city implements a new policy to provide free public transit passes to all residents whose annual household income is below $30,000. A researcher evaluates the policy's impact on employment rates by comparing the employment outcomes of residents with incomes between $29,000 and $29,999 (who received the pass) to those with incomes between $30,000 and $30,999 (who did not). Which of the following scenarios represents the most significant threat to the validity of this study's design?
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A city implements a new policy to provide free public transit passes to all residents whose annual household income is below $30,000. A researcher evaluates the policy's impact on employment rates by comparing the employment outcomes of residents with incomes between $29,000 and $29,999 (who received the pass) to those with incomes between $30,000 and $30,999 (who did not). Which of the following scenarios represents the most significant threat to the validity of this study's design?
A city implements a new policy to provide free public transit passes to all residents whose annual household income is below $30,000. A researcher evaluates the policy's impact on employment rates by comparing the employment outcomes of residents with incomes between $29,000 and $29,999 (who received the pass) to those with incomes between $30,000 and $30,999 (who did not). Which of the following scenarios represents the most significant threat to the validity of this study's design?
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