Sinara reads a story reporting that children who attend pres…
Sinara reads a story reporting that children who attend preschool do better in kindergarten than children who do not attend preschool. She wonders if that means that attending preschool causes children to do better in kindergarten. If so, she will send her child to preschool for sure. Applying the three causal criteria, Sinara knows there is covariance and temporal precedence. Which of the following questions would help Sinara ask about the third criterion, internal validity?