Question

An important application of regression analysis in accounting is in the estimation of cost. By collecting data on volume and cost and using the least squares method to develop an estimated regression equation relating volume and cost, an accountant can estimate the cost associated with a particular manufacturing volume. Consider the following sample of production volumes and total cost data for a manufacturing operation.

Production Volume (units)	Total Cost ($)
400	4,400
450	5,400
550	5,800
600	6,300
700	6,800
750	7,400

1. Compute b₁ and b₀ (to 1 decimal).
   b₁  
   b₀  
   
   Complete the estimated regression equation (to 1 decimal).
   y =  +   
   
2. What is the variable cost per unit produced (to 1 decimal)?
   $
   
3. Compute the coefficient of determination (to 3 decimals). Note: report r² between 0 and 1.
   r² =  
   
   What percentage of the variation in total cost can be explained by the production volume (to 1 decimal)?
   %
   
4. The company's production schedule shows 500 units must be produced next month. What is the estimated total cost for this operation (to the nearest whole number)?

Answer 1

a)

b1=7.6

bo=1646.7

b)

variable cost =7.6

c)

SST=Syy=		5,648,333.3333
SSE =Syy-(Sxy)2/Sxx=		233,333.333
SSR =(Sxy)2/Sxx =		5,415,000.0000

Coeffficient of determination R^2 =SSR/SST=

0.959

  percentage of the variation in total cost can be explained by the production volume =95.9 %

d)

predicted val=1646.667+500*7.6=

5447