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\textbf{Suppose a certain scale is not calibrated correctly, and as a result, the mass of any object is displayed as 0.75 kilogram less than its actual mass. What is the correlation between the actual masses of a set of objects and the respective masses of the same set of objects displayed by the scale?} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{Since the actual mass is always 0.75kg more than the displayed mass, they are perfectly correlated.~} 