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The relevant domain is the set of values that the variable in question can take. Some variables, such as age or length, for example, cannot be negative; some variables, such as the number of children in a class must be whole numbers.
outside the relevant range, variable cost and fixed cost behaviors patterns may change
Independent variable is the variable that you change in an experiment.
Same meaning as relevant
a standardizing variable is a variable that has a mean of zero and a standard deviation of one .