EBK PRINCIPLES OF OPERATIONS MANAGEMENT
10th Edition
ISBN: 8220102744059
Author: HEIZER
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 13P
At you can see in the following table, demand for heart transplant surgery at Washington General Hospital has increased steadily in the past few years:
The director of medical services predicted 6 years ago that demand in year 1 would be 41 surgeries.
a) Use exponential smoothing, first with a smoothing constant of .6 and then with one of .9, to develop forecasts for years 2 through 6.
b) Use a 3-year moving average to forecast demand in years 4, 5, and 6.
c) Use the trend-projection method to forecast demand in years 1 through 6.
d) With MAD as the criterion, which of the four
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Students have asked these similar questions
The following data show the number of liters of gasoline sold by Mackrin's in Colorado for the past 12 weeks.
Which forecasting model would you recommend to Mackrin's manager? Why?
What demand forecast would you recommend for week 13?
Week
Actual Demand (1000 liters)
Forecasting (1000 liters)
FSMA
/A-F/
FWMA
/A-F/
FES, α=0.3
/A-F/
1
17
2
21
17
4
3
19
18.2
0.8
4
23
19
4
18.44
4.56
5
18
21
3
20.8
2.8
19.81
1.81
6
16
20
4
20
4
19.3
3.3
7
20
19
1
18.3
2.3
18.31
1.69
8
18
18
0
18.7
0.7
18.82
0.82
9
22
18
4
18.2
4.2
18.6
3.4
10
20
20
0
19.8
0.2
19.62
0.38
11
15
20
5
20.2
5.2
19.73
4.73
12
22
19
3
18.2
3.8
18.3
3.7
13
19
19.5
19.41
MAD
2.67
2.9
2.7
MSE
10.22…
Sales of Volkswagen's popular Beetle have grown steadily at auto dealerships in Nevada during the past 5 years (see table below).
Year
Sales
1
450
2
510
3
516
4
563
575
a) Forecasted sales for year 6 using the trend projection (linear regression) method are 613.7 sales (round your response to one decimal place).
b) The MAD for a linear regression forecast is
sales (round your response to one decimal place).
The past two years sales at ACSR Inc. were 3 million and 5 million. Their forecast
team used a two-period moving average to forecast its sales this year. But the actual
sales for this year were 5 million. Now, the forecast team wants to forecast its sales for
next year by using exponential smoothing with alpha equals 0.6.
What is the forecast using exponential smoothing with alpha = .6?
2. If we decide to use an alpha of .2 instead of .6, will we be ‘weighting the error from the previous period higher or the Forecast from the previous
period higher? Explain briefly or show using math!
(In this question I am asking if we change the alpha to a lower alpha, what will be the effect – what will we be ‘weighing’ as more important?)
Chapter 4 Solutions
EBK PRINCIPLES OF OPERATIONS MANAGEMENT
Ch. 4 - Ethical Dilemma We live in a society obsessed with...Ch. 4 - What is a qualitative forecasting model, and when...Ch. 4 - Identify and briefly describe the two general...Ch. 4 - Identify the three forecasting time horizons....Ch. 4 - Briefly describe the steps that are used to...Ch. 4 - A skeptical manager asks what medium-range...Ch. 4 - Explain why such forecasting devices as moving...Ch. 4 - What is the basic difference between a weighted...Ch. 4 - What three methods are used to determine the...Ch. 4 - Research and briefly describe the Delphi...
Ch. 4 - What is the primary difference between a...Ch. 4 - Define time series.Ch. 4 - What effect does the value of the smoothing...Ch. 4 - Explain the value of seasonal indices in...Ch. 4 - Prob. 14DQCh. 4 - In your own words, explain adaptive forecasting.Ch. 4 - Prob. 16DQCh. 4 - Explain, in your own words, the meaning of the...Ch. 4 - Prob. 18DQCh. 4 - Give examples of industries that are affected by...Ch. 4 - Prob. 20DQCh. 4 - Prob. 21DQCh. 4 - CEO John Goodale, at Southern Illinois Power and...Ch. 4 - The following gives the number of pints of type B...Ch. 4 - a) Plot the above data on a graph. Do you observe...Ch. 4 - Refer to Problem 4.2. Develop a forecast for years...Ch. 4 - A check-processing center uses exponential...Ch. 4 - The Carbondale Hospital is considering the...Ch. 4 - The monthly sales for Yazici Batteries, Inc., were...Ch. 4 - The actual demand for the patients at Omaha...Ch. 4 - Daily high temperatures in St. Louis for the last...Ch. 4 - Lenovo uses the ZX-81 chip in some of its laptop...Ch. 4 - Data collected on the yearly registrations for a...Ch. 4 - Use exponential smoothing with a smoothing...Ch. 4 - Prob. 12PCh. 4 - At you can see in the following table, demand for...Ch. 4 - Prob. 14PCh. 4 - Refer to Solved Problem 4.1 on page 144. a) Use a...Ch. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Income at the architectural firm Spraggins and...Ch. 4 - Resolve Problem 4.19 with = .1 and =.8. Using...Ch. 4 - Prob. 21PCh. 4 - Refer to Problem 4.21. Complete the trend-adjusted...Ch. 4 - Prob. 23PCh. 4 - The following gives the number of accidents that...Ch. 4 - In the past, Peter Kelles tire dealership in Baton...Ch. 4 - George Kyparisis owns a company that manufactures...Ch. 4 - Attendance at Orlandos newest Disneylike...Ch. 4 - Prob. 28PCh. 4 - The number of disk drives (in millions) made at a...Ch. 4 - Prob. 30PCh. 4 - Emergency calls to the 911 system of Durham, North...Ch. 4 - Using the 911 call data in Problem 4.31, forecast...Ch. 4 - Storrs Cycles has just started selling the new...Ch. 4 - Boulanger Savings and Loan is proud of its long...Ch. 4 - Mark Gershon, owner of a musical instrument...Ch. 4 - Prob. 44PCh. 4 - Cafe Michigans manager, Gary Stark, suspects that...Ch. 4 - Prob. 46PCh. 4 - The number of auto accidents in Athens, Ohio, is...Ch. 4 - Rhonda Clark, a Slippery Rock, Pennsylvania, real...Ch. 4 - Accountants at the Tucson firm, Larry Youdelman,...Ch. 4 - Prob. 50PCh. 4 - Using the data in Problem 4.30, apply linear...Ch. 4 - Bus and subway ridership for the summer months in...Ch. 4 - Prob. 53PCh. 4 - Dave Fletcher, the general manager of North...Ch. 4 - Sales of tablet computers at Ted Glickmans...Ch. 4 - The following are monthly actual and forecast...Ch. 4 - Develop a forecasting model, justifying its...Ch. 4 - Prob. 2CSCh. 4 - Discuss the schools options.Ch. 4 - Prob. 1.1VCCh. 4 - Prob. 1.2VCCh. 4 - Using Perezs multiple-regression model, what would...Ch. 4 - Prob. 1.4VCCh. 4 - Describe three different forecasting applications...Ch. 4 - What is the role of the POS system in forecasting...Ch. 4 - Justify the use of the weighting system used for...Ch. 4 - Name several variables besides those mentioned in...Ch. 4 - Prob. 2.5VC
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