Gator Beach Marts, a chain of convenience grocery stores in the Fort Lauderdale area, has store hours that fluctuate from month to month as the tourist trade in the community varies. The utility costs for one of the company's stores are listed below for the past six months. Total Hours Month of Operation Total Utility Cost January 550 $2,170 February 600 2,300 March 700 2,600 April 500 2,100 May 450 1,800 June 400 1,700 Required: 1-a. Use the high-low method to estimate the cost behavior for the store's utility costs. Express the cost behavior in formula form (Y = a + bx). 1-b. What is the variable utility cost per hour of operation? 3-a. Construct an Excel spreadsheet and use the Excel commands to perform a least-squares regression. Estimate the cost behavior for the store's utility cost. Express the cost behavior in formula form. 3-b. What is the variable utility cost per hour of operation? 4. During July, the store will be open 300 hours. Predict the store's total utility cost for July using each of the cost-estimation methods employed in requirements (1) and (3). Construct an Excel spreadsheet and use the Excel commands to perform a least-squares regression. Estimate the cost behavior for the store's utility cost. Express the cost behavior in formula form. (Do not round intermediate calculations. Round the intercept to the nearest whole number and the slope to two decimal places.) Monthly utility cost= X During July, the store will be open 300 hours. Predict the store's total utility cost for July using each of the cost-estimation methods employed in requirements (1) and (3). (Do not round intermediate calculations. Round the intercept to the nearest whole number and the slope to two decimal places.) Cost Predictions High-low method $ 1,400 Least-square regression What is the variable utility cost per hour of operation? (Do not round intermediate calculations. Roun nearest whole number and the slope to two decimal places.) Variable utility cost per hour