Measure error in resistivity

The maximum propagated uncertainty in the evaluation of the resistance R(I, V) using the chain rule for differentiation and Ohm s law, Equation 3.1, is 

For example, if the overall percentage uncertainty in current due to readability and indicated error is 5 % and that due to voltage is 3 %, then ARmax= 0.08 R and ARrms=+0.058 R, the latter being smaller in magnitude. 

---