Experiments can be used to identify causal relationship, something that is difficult or impossible to do with other methods. 3. Why are control groups used in experiments? What do they do for you? The ...

Newly compiled records are spilling the beans on one of the CIA’s most notorious and shadowy programs: MKUltra, a wild ...

When carrying out the experiment, care has to be taken that other variables that affect the rate of reaction, such as concentration of reactants, are kept constant. These are control variables.