which does independent variable pair/associates with?

Variable IIndependent pairs with: O Two equivalent units are sought: an experimental group and the other control group O Test units are randomly assigned to groups in the experiment O Change in test units as a result of the passage of time O Extreme values (highs and lows) tend to regress towards the average O Changes in the calibration of the instrument or observers used to measure the variable O Events external to the experiment, but occurring at the same time as the experiment O In this variable you can see the effect or result of the manipulated variable ( Changes in the dependent variable as a result of the initial measurement Treatment and control groups are not the same before starting the experiment (O Variable that produces the effect on the other variable Variable IIndependent pairs with: O Two equivalent units are sought: an experimental group and the other control group O Test units are randomly assigned to groups in the experiment O Change in test units as a result of the passage of time O Extreme values (highs and lows) tend to regress towards the average O Changes in the calibration of the instrument or observers used to measure the variable O Events external to the experiment, but occurring at the same time as the experiment O In this variable you can see the effect or result of the manipulated variable ( Changes in the dependent variable as a result of the initial measurement Treatment and control groups are not the same before starting the experiment (O Variable that produces the effect on the other variable