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-- None of those words relates to "precise". -- "Accuracy" relates to "reliable". -- "Precision" and "accuracy" are two different things. -- "Precise" does not mean "reliable".
Independent variable is the variable that you change in an experiment.
a standardizing variable is a variable that has a mean of zero and a standard deviation of one .
State what the variable represents in the equation.
The variable is the letter, the thing that can be changed.