:History (history) pairs with: Co Two equivalent units are sought: an experimental group and the other control group

? The test units are randomly assigned to the groups of 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 In this variable you can see the effect or result of the manipulated variable

O Changes in the dependent variable as a result of the initial measurement
? The treatment and control groups are not the same before starting the experiment

O Variable that produces the effect on the other variable
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