Karen was attempting to estimate a model for her small business's overhead costs. She is 99.9% sure that overhead costs are driven primarily by production, but she also knows that this cost isn't entirely variable. So she grabbed the last 8 months of production and overhead cost data, listed it out, and plotted it as follows. Month # of Units Produced 1 2 34 56 7 8 270 230 300 360 380 340 290 310 Overhead Cost $3,400 2,530 3,140 3,900 3,580 3,770 3,130 3,900 Karen is planning to use the high-low method to estimate this cost function. Is it important for the data to exhibit a linear relationship when using this method? It is (b) important for the data to exhibit a linear relationship. eTextbook and Media Help Karen estimate her company's overhead costs using the high-low method. Write your final model in Y = m(X) + b format. Y=$ X+ $