A regression model may be made more accurate by: Select one: a. increasing the number of observations b. using the high-low (2 factor) algorithm c. re-ordering the data from the lowest Y-value to the highest Y-value d. setting the intercept as the data's point of origin In long term management decision-making the relevant profit measure is: Select one: a. The Gross Profit Margin b. The Opportunity Cost c. The Contribution Margin d. The Segment Margin