Part B? (My answer in the box is incorrect)

The materials handling manager of a manufacturing company is trying to forecast the cost of maintenance for the company's fleet of over-the-road tractors. The manager believes that the cost of maintaining the tractors increases with their age. The following data was collected: Age (years) 6.5 7.5 6.5 5.0 6.0 6.0 8.0 7.0 7.5 Yearly Maintenance Cost (5) 1,219 1,649 1,633 1,095 1,323 1,281 1,490 2,122 1,587 Age (years) 6.0 2.5 2.5 9.0 8.0 3.0 3.0 3.0 Yearly Maintenance Cost ($) 1.794 763 782 1.364 1.973 1.578 1,066 1,149 a. Use POM for Windows' least squares-linear regression module to develop a relationship to forecast the yearly maintenance cost based on the age of a tractor. (Enter your responses rounded to three decimal places and include a minus sign if necessary.) Y = 744.346 + 115.609 X where Y = Yearly maintenance cost in dollars and X = Age in years. b. If a section has 20 three-year-old tractors, what is the forecast for the annual maintenance cost? $3056.53. (Enter your response rounded to two decimal places.)