Question: A researcher examines a bivariate relationship between x 1 and y and sees an association between the two variables. When they include a control variable,

A researcher examines a bivariate relationship between x1 and y and sees an association between the two variables. When they include a control variable, x2, they suspect the variable is an intervening variable, What did they see happen to the relationship between x1 and y when they included x2?

Group of answer choices:

  • relationship between x1 and y did not change
  • relationship between x1 and y was different for different levels of x2
  • relationship between x1 and y disappeared
  • relationship between x1 and y became stronger

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