Total Hours Month of Operation January 400 February March 750 April 350 May 300 June 250 Total Utility Cost $2,220 3,000 3,600 2,100 1,750 1,600 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). Complete this question by entering your answers in the tabs below. Req 1A Req Req Reg 3B 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 = Complete this question by entering your answers in the tabs below. Req 1A Reg 1B Req Req 3B Reg 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). (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 Least-square regression