Question

Horton Manufacturing Inc. produces blinds and other window treatments for residential homes and offices. The owner...

Horton Manufacturing Inc. produces blinds and other window treatments for residential homes and offices. The owner is concerned about the maintenance costs for the production machinery because maintenance costs for the previous fiscal year were higher than he expected. The owner has asked you to assist in estimating future maintenance costs to better predict the firm’s profitability. Together, you have determined that the best cost driver for maintenance costs is machine hours. The data from the previous fiscal year for maintenance costs and machine hours follow:

Month Maintenance Costs Machine Hours
1 $ 2,625 1,499
2 2,670 1,590
3 2,720 1,605
4 2,820 1,655
5 2,855 1,775
6 3,005 1,880
7 2,865 1,785
8 2,905 1,805
9 2,780 1,695
10 2,570 1,410
11 2,590 1,550
12 2,890 1,425

Required:

1. Use the high-low method to estimate the fixed and variable portions for maintenance costs. (In your calculations, round "slope (unit variable cost)" to 4 decimal places. Enter the "slope (unit variable cost)" rounded to 4 decimal places and and all other calculations, to nearest whole dollar.)

Graph the data points to check for possible outliers and determine whether the points selected in requirement 1 are representative of the data. (To earn full credit for this graph you must plot all required points. While plotting the points a tool icon will pop up. You can use this to enter exact co-ordinates for your points as needed.)

3. Calculate the mean absolute percentage error (MAPE) for the cost equation you developed in requirement 1. (Do not round intermediate calculations, with the exception of MAPE for each month, which should be rounded to three decimal places. Input your final answer as a percentage rounded to 1 decimal place (i.e., .054 = 5.4%).)

Homework Answers

Answer #1
1) Maintenance Costs
At highest activity : X2 = 1880 Y2 = $3,005
At lowest activity : X1= 1410 Y1= $2,570
.
Variable Maintenance Costs per Machine hour =(3005-2570) /(1880-1410) $0.9255
Total Maintenance Fixed Costs = 3005-(1880*0.9255) = $1,265
3) Month Machine Hours Actual Maintenance Costs Forecasted Maintenance Absolute Percent Error
1 1,499 $ 2,625 $ 2,652 1.041%
2 1,590 2,670 2,737 2.492%
3 1,605 2,720 2,750 1.119%
4 1,655 2,820 2,797 -0.826%
5 1,775 2,855 2,908 1.848%
6 1,880 3,005 3,005 -0.002%
7 1,785 2,865 2,917 1.816%
8 1,805 2,905 2,936 1.051%
9 1,695 2,780 2,834 1.932%
10 1,410 2,570 2,570 -0.002%
11 1,550 2,590 2,700 4.229%
12 1,425 2,890 2,584 -10.594%
MAPE 0%
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