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 companys stores are listed below for the past six months.

Month	Total Hours of Operation			Total Utility Cost
January		550			$	2,370
February		600				2,500
March		800				3,100
April		500				2,300
May		450				2,000
June		400				1,900

Required: 1-a. Use the high-low method to estimate the cost behavior for the stores 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 stores total utility cost for July using each of the cost-estimation methods employed in requirements (1) and (3).

Use the high-low method to estimate the cost behavior for the stores utility costs. Express the cost behavior in formula form (Y = a + bX).

Monthly utility cost =

+

X

What is the variable utility cost per hour of operation?

Variable cost per hour

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

What is the variable utility cost per hour of operation? (Do not round intermediate calculations. Round the intercept to the nearest whole number and the slope to two decimal places.)

Variable utility cost

per hour

During July, the store will be open 300 hours. Predict the stores 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