In a recent poll concerning sales and earnings, 15 companies responded with the following information. Earnings Company PhotoFinish Co. CanTech Supply The Grayson Group I JenCo Biotech Co Capital Consultants 3 Scatter Plot Sales ($ thousands) 53.7 20 40 60 80 100 Sales 35.8 17.8 E 88.7 42.0 13.8 a) What are the dependent/independent variables? Earnings ($ thousands) 4.1 4.5 3.1 # 6.2 4.6 44 b) Based on the scatter plot above, estimate the slope of the line. For full marks your answer should be accurate to at least two decimal places. b) Based on the scatter plot above, estimate the y-intercept of the line. For full marks your answer should be accurate to at least one decimal place. d) From your findings in part b and c, determine the linear regression equation.