well it is something that varies but is also able
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Factorial designs
Some times. At other times it uses mutually dependent variables (changes in each variable affect the other).
A good starting point to research and very good at showing relationship between variables but doesn't demonstrate cause and effect
Every time the independent variables change, the dependent variables change.Dependent variables cannot change if the independent variables didn't change.
control variables: the things that are not changing.Independent variables: the things that you change.Dependent variables: the things that are changed due to the independent variable