2: The following data relating to units shipped and total shipping expense have been assembled by YORK, a wholesaler of large, custom-built air-conditioning units for commercial buildings: (5-Marks) Month Total Shipped units ....... 1 January .9. 2 February .18.. 3 March 12 4 April .15. 5 May .21. 6 June .24.. 7 July ..6 Shipping Expenses $ 4,500 $5,750 .$ 4,250 $5,000 $5,750 $6,750 .$ 3,000 a. Use the high-low method to find the cost formula for shipping expense: Shipping Expenses b. Use the regression method (Graph x/y) to find the cost formula for shipping expense: Shipping Expenses = c. Estimate the total cost in the next month if the number of shipped units is expected to be 11 Using High-Low Method: . Using Regression analysis (Graph X/Y)