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In the four compartment model, three compartments are measured by three different methods, the fourth is calculated
That's Correct!
It's Wrong!
In the four compartment model, three compartments are measured by three different methods, which means that the values for these compartments are obtained through direct measurement. The fourth compartment, however, is not directly measured but rather calculated using the values obtained from the other three compartments. Therefore, the statement that the fourth compartment is calculated is correct.