Dali€™s Financial Services prepares tax returns for small businesses. Data on the company€™s total costs and output for the past six months appear in the table that follows. The results of regression analysis are also provided.
a. Plot the data and the regression line on a graph.
b. Estimate total monthly costs for a month when 330 tax returns are prepared, using the estimates from the regression output.

Regression output: TC = $78,045 + ($401 × Number of taxreturns).

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Month Tax Returns Prepared 200 280 300 260 260 240 Total Costs January $160,000 192,000 198,000 180,000 186,000 170,000 February March April In May June