A correlation coefficient of 1 or -1 would be the highest possible statistical relationship. However, the calculation of correlation coefficients between non independent values or small sets of data may show high coefficients when no relationship exists.
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The product-moment correlation coefficient or PMCC should have a value between -1 and 1. A positive value shows a positive linear correlation, and a negative value shows a negative linear correlation. At zero, there is no linear correlation, and the correlation becomes stronger as the value moves further from 0.
A graph of Charles Law shows the relationship between temperature and volume of gas.
Any graph where, from left to right, the slope goes upward (assuming the axes are labelled in the standard way).
Mapping Diagram
it is called an inequality