Operations Management: Processes and Supply Chains (12th Edition) (What's New in Operations Management)
12th Edition
ISBN: 9780134741062
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Chapter 8, Problem 6P
Marianne Kramer, the owner of Handy Man Rentals, rents carpet cleaners to contractors amid walk-in customers. She is interested in arriving at a
- Prepare a forecast for weeks 6 through 10 by using a 4-week moving average. What is the forecast for week 11?
- Calculate the mean absolute deviation as of the end of week 10.
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Here are the actual tabulated demands for an item for a nine-month period (January through September). Your supervisor wants to test two forecasting methods to see which method was better over this period.
MONTH
ACTUAL
January
120
February
145
March
146
April
171
May
154
June
182
July
138
August
135
September
146
a. Forecast April through September using a three-month moving average.
b. Use simple exponential smoothing with an alpha of 0.20 to estimate April through September, using the average of January through March as the initial forecast for April.
c-1. Calculate MAD for Three-month moving average and Exponential smoothing.
c-2. Use MAD to decide which method produced the better forecast over the six-month period.
Marianne Schwartz, the owner of Handy Man Rentals, rents carpet cleaners to contractors and walk-in customers. She is interested in arriving at a forecast of rentals so that she can order
the correct quantities of supplies that go with the cleaners. Data for the last 10 weeks are shown here.
Week
1
2
3
4
8
9
10
Rentals
20
20
34
26
21
12
21
26
19
14
a. Prepare a forecast for weeks 6 through 10 by using a 4-week moving average. (Enter your responses rounded to two decimal places.)
Week
Forecast
6
25.25
7
23.25
8
20
9
20
10
19.5
What is the forecast for week 11? 20 rentals. (Enter your response rounded to two decimal places.)
b. The mean absolute deviation as of the end of week 10 is rentals. (Enter your response rounded to two decimal places.)
14
Community General Hospital finds itself treating many bicycle accident victims. Data from the last seven 24-hour periods is shown below:
Day Bicycle Victims
1 8
2 14
3 8
4 14
5 18
6 15
With an alpha value of 0.31 and a starting forecast in day 3 equal to the 21 , what is the exponentially smoothed forecast for day 4? (Round to two decimal places)
15
What is the exponentially smoothed forecast for day 5? (Round to two decimal places)
16
Chapter 8 Solutions
Operations Management: Processes and Supply Chains (12th Edition) (What's New in Operations Management)
Ch. 8 - Figure 8.9 shows summer air visibility...Ch. 8 - Kay and Michael Passe publish What‘s...Ch. 8 - Demand for oil changes at Garcia’s Garage has...Ch. 8 - Prob. 2PCh. 8 - Ohio Swiss Milk Products manufactures and...Ch. 8 - A manufacturing firm has developed a skills test,...Ch. 8 - The materials handling manager of a manufacturing...Ch. 8 - Marianne Kramer, the owner of Handy Man Rentals,...Ch. 8 - Sales for the past 12 months at Computer Success...Ch. 8 - Bradley’s Copiers sells and repairs photocopy...
Ch. 8 - Consider the sales data for Computer Success given...Ch. 8 - A convenience store recently started to carry a...Ch. 8 - Community Federal Bank in Dothan, Alabama,...Ch. 8 - The number of heart surgeries performed at...Ch. 8 - The following data are for calculator sales in...Ch. 8 - Prob. 14PCh. 8 - Forrest and Dan make boxes of chocolates for which...Ch. 8 - The manager of Alaina’s Garden Center must make...Ch. 8 - The manager of a utility company in the Texas...Ch. 8 - Franklin Tooling, Inc., manufactures specialty...Ch. 8 - Create an Excel spreadsheet on your own that can...Ch. 8 - Prob. 20PCh. 8 - Using the data in Problem 20 and the Time-Series...Ch. 8 - Prob. 22PCh. 8 - Cannister, Inc., specializes in the manufacture of...Ch. 8 - The Midwest Computer Company serves a large number...Ch. 8 - A certain food item at P=0.20 (with a combination...Ch. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - A manufacturing firm seeks to develop a better...Ch. 8 - How much does the forecasting process at Deckers...Ch. 8 - Prob. 2VCCh. 8 - What factors make forecasting at Deckers...Ch. 8 - Prob. 4VCCh. 8 - Prob. 5VCCh. 8 - Comment on the forecasting system being used by...Ch. 8 - Develop your own forecast for bow rakes for each...
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