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A researcher suspects that people living in urban environments earn higher incomes than those in suburban or rural environments. Which of the following is NOT
A researcher suspects that people living in urban environments earn higher incomes than those in suburban or rural environments. Which of the following is NOT required to establish a causal link?
Options below:
- demonstrate that income is the control variable
- demonstrate that the effect is not explained by other factors
- demonstrate that living environment and income are correlated
- demonstrate that living environment precedes income
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