The regional transit authority for a major metropolitan area wants to determine whether there is any relationship between the age of a bus and the annual maintenance cost. A sample of buses resulted in the following data. Age of Bus (years) Maintenance Cost ($) 1 350 2 370 2 480 2 520 2 590 3 550 4 750 4 800 5 790 5 950 a. Develop the least squares estimated regression equation (to decimals, if necessary). b. Test to see whether the two variables are significantly related with alpha = 0.05.c. Did the least squares line provide a good fit to the observed data?d. Develop 95% prediction interval for the maintenance cost for a specific bus that is 4 years old (to 1 decimal).