chairs that are sold by various retailers across the country. The following table details the company's sales and costs for the first six months of this year. 12.APPENDIX 3A ESTIMATING VARIABILITY. Andrews Manufacturing makes folding Andrews Manufacturing Number of Manufacturing Cost Observation Units (x) January February 500 $9,500.00 750 $11,000.00 DEFINING AND USING COST EST Andrews Manufacturing Number of Units (x) Manufacturing Cost Observation March April May June 600 $9,800.00 1,000 $13,000.00 900 $12,200.00 800 $11,400.00 4,550 $66,900.00 Sum REQUIRED a. Using the high-low method, calculate the variable and fixed costs of production b. Using the scattergram method, estimate the variable and fixed costs of produc c. Using least squares regression, calculate the variable and fixed costs of produc- for Andrews Manufacturing. tion for Andrews Manufacturing. tion for Andrews Manufacturing