Which of the following is true regarding third variables in nonexperimental methods?
O They help a researcher determine which of the other two variables is operating in a given situation.
O They are also called subject variables and personal attributes.
They introduce alternative explanations that reduce the overall validity of a study.
○ They are mostly used to enhance nonexperimental methods.
O They help a researcher determine which of the other two variables is operating in a given situation.
O They are also called subject variables and personal attributes.
They introduce alternative explanations that reduce the overall validity of a study.
○ They are mostly used to enhance nonexperimental methods.