The only disadvantage of a global variable is that you cannot directly encapsulate them. Other than that, there is no real disadvantage of global variables.
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Advantages: you can see an exact number. Disadvantages: you cannot see the changes between intervals.
ADVANTAGES Shows relationship between two variables best method to illustrate a non-linear pattern.
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
to quantify the qualitative variables.