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Sharon 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 Overhead Cost 1 210 $2,320 2 170 1,640 3 240 1,990 4 300 2,560 5 320 2,240 6 280 2,020 7 230 2,010 8 250 2,710 (a1) Sharon 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