Operations Management: Processes and Supply Chains (11th Edition)
11th Edition
ISBN: 9780133872132
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 9P
Consider the sales data for Computer Success given in Problem 7.
- Use a 3-month weighted moving average to
forecast the sales for the months April through December. Use weights of - Use exponential smoothing with
- Compare the performance of the two methods by using the mean absolute deviation as the performance criterion, with error measurement beginning in April. Which method would you recommend?
- Compare the performance of the two methods by using the mean absolute percent error as the performance criterion, with error measurement beginning in April. Which method would you recommend?
- Compare the performance of the two methods by using the mean squared error as time performance criterion, with error measurement beginning in April. Which beginning would you recommend?
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The following data are for calculator sales in units at an electronics store over the past nine weeks:
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53
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59
4
51
9
64
5
57
Use trend projection with regression to forecast sales for weeks 10 - 13. What are the error measures (CFE, MSE, o, MAD, and MAPE) for this forecasting procedure? How about ?
Obtain the trend projection with regression forecast for weeks 10 – 13. (Enter your responses rounded to two decimal places.)
Period
Forecast, F,
10
64.81
11
67.06
12
69.31
13
71.56
Obtain the error measures. (Enter your responses rounded to two decimal places.)
CFE
MSE
MAD
МАРЕ
The following data are for calculator sales in units at an electronicsstore over the past 9 weeks:Week Sales Week Sales1 46 6 582 49 7 623 43 8 564 50 9 635 53Use trend projection with regression to forecast sales for weeks 10–13. What are the error measures (CFE, MSE, s, MAD, and MAPE) for this forecasting procedure? How about r2?
The monthly sales for Yazici Batteries, Inc., were as follows:
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Jan
Feb
Mar
Apr May
Jun
Jul
Aug Sept
Oct
Nov
Dec
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20
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16
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17
19
22
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20
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This exercise contains only parts b and c.
b) The forecast for the next month (Jan) using the naive method =
sales (round your response to a whole number).
The forecast for the next period (Jan) using a 3-month moving average approach =
sales (round your response to two decimal places).
The forecast for the next period (Jan) using a 6-month weighted average with weights of 0.10, 0.10, 0.10, 0.20, 0.20, and 0.30, where the heaviest
weights are applied to the most recent month = sales (round your response to one decimal place).
sales (round your response
Using exponential smoothing with a = 0.30 and a September forecast of 18.00, the forecast for the next period (Jan) =
to two decimal places).
Using a method of trend projection, the forecast for the
month (Jan) = sales (round your response to two decimal places).
c) The method…
Chapter 8 Solutions
Operations Management: Processes and Supply Chains (11th Edition)
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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