Experiments take place in controlled conditions.
[IV] is manipulated to see the effect of the [DV].
From this manipulation, a cause-and-effect relationship can be claimed.
Bandura, Ross & Ross (1961) set up a situation in which children watched adults 'beating' a bobo doll or playing in other ways. Some children watched the aggressive behaviour while others watched adults behaving in a non-aggressive way. The [IV] was whether the adult was aggressive or not. The [DV] was whether the children then imitated the adult's actions when playing with a bobo doll themselves.
Controlling a number of factors such as the age of the child or what they watched, allowed a cause-and-effect relationship to be concluded.
~If young children watch adults behaving aggressively, they are likely to imitate that aggression~
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