(iii) V = a exp (-bU), (i) Use the results of Section 5.2.1 to calculate the (iv) utv = a. unweighted best-fit gradient and intercept, and their uncertainties. (ii) Calculate the common uncertainty, (5.3) Best-fit straight line-an unweighted fit acu, and compare the value with the experimental uncer- The data listed below come from an experiment to verify tainty. (iii) Plot a graph of the data and add the best-fit Ohm's law. The voltage across a resistor (the dependent straight line. (iv) Calculate the residuals, and comment variable) was measured as a function of the current flow- on their magnitudes. ing (the independent variable). The precision of the volt- meter was 0.01 mV, and the uncertainty in the current was negligible. Current (JA) 10 20 30 40 50 Voltage (mV) 0.98 1.98 2.98 3.97 4.95 Current (JA) 60 70 80 90 Voltage (mV) 5.95 6.93 7.93 8.91