In an experiment, the following correspondence was found between temperature T (in °C) and electrical resistance R (in MΩ). T 400 450 500 550 600 650 R 0.41 0.95 2.5 5.10 12.5 18
a) Find the least squares line R= aT + b. b) Use this line to estimate the resistance at T = 700. c) Would a parabola be a better fit? Justify your answer