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The vast majority of all graphs do that.
It is a ratio.
Derived unit
It is a ratio.
It is the constant of proportionality.
Interval and ratio
nominal and ordinal is wrong; those are the two types of qualitative variables. Ratio and interval are the two types of quantitative variables.
The two variables are correlated.
Represent two variables on two axes.
x and y
They illustrate the relationship between two (or more) variables.
Quotient.
Any graph.
The vast majority of all graphs do that.
It is a ratio.
It is the constant of proportionality.
It is a ratio.