## Transcribed Text

Problem 1
Chapter 3: critical dimension of the service quality of call center is the
wait time of caller to get to sales representative. Periodically, random
samples of 6 (n = 6) customer calls are measured for time. Results from the
last six samples are shown in the following table.
Observation (seconds)
Sample
1
2
3
5
6
425
408
422
380
410
401
440
450
431
447
422
430
3
402
428
419
434
433
425
375
400
395
420
380
385
408
407
407
435
411
405
6
398
417
400
418
402
425
410
435
395
397
390
410
8
395
402
397
408
400
415
a) Management willing to use three sigma limits. Use the data and Table
3.1 (page 107) to determine the control limits for an R-chart and an I-
chart.
b) Plot sample means and ranges on their respective control charts and
interpret the results.
Problem
Chapter 4: Watch the video for the case "Gate Turnaround at Southwest
Airlines" (Pages 156&157) and answer the following two questions. Please
reference all outside resources if you use any other than the
textbook.
a) What is the key competitive priority of SWA (see Table 1.3 on page 12
of the text book for widely accepted competitive priorities)? Talk about
SWA's strategic capacity decision and how supports SWA's
competitive priority.
b)How would you measure capacity and utilization in the airline industry?
Talk about some of the important metrics that are used to define
capacity in the airline industry and explain (or formulate) how these
metrics can be used to calculate airline capacity and utilization.
1
Problem 3
Chapter 5: The figure below shows the flow of car wash process that has
three stations; vacuum, wash, and dry. The numbers in parentheses are the
times in minutes for each step of the process.
Vacuum
Wash
Dry
5 mins)
(10 mins)
(6 mins)
Answer parts a, b, and assuming that car can advance to the next station
as soon as the next station ready (idle).
a) What the throughput time to complete car wash when there are no
waiting lines?
b) What the capacity of the car wash process?
c) How would the capacity of the system change another wash station
added, i.e. what the system capacity with two wash stations?
d) Assume the car wash station serves only one car at time, i.e. the
station will not start vacuming the next car in the line until the one in
the system has gone through all three processes (vacuum, wash, and
dry). What would be the capacity of the system in this case?
Problem 4
Chapter 5: company is setting up an assembly line to produce 90 units
per hour. The table below identifies the work elements, times, and
immediate predecessors
Work
Time
Immediate
Element
(Sec.)
Predecessor(s)
35
B
20
A
C
30
B
D
23
c
E
28
D
F
15
B
G
17
F
H
15
F
12
G.H
J
23
E,I
a) What cycle time is required to satisfy the required output?
b) What is the theoretical minimum number of stations?
c) Use one of the heuristic decision rules described in Table 5.3 on page
191 to balance the assembly line so that will produce 90 units per
hour. Clearly state which decision rule you are using and the work
elements assigned to each station.
d) What the efficiency of the line you found in part c?
Problem
Chapter 6: Watch the video for the case "Lean Systems at Autoliv" (pages
2348235 and describe, in about one page, the JIT considerations presented
in the chapter as they relate Autoliv's manufacturing environment.
3
Problem 6
Chapter 8: Observed monthly sales of popular brand tennis shoe at a
medium-sized sports store the town's mall over the first eight months of
the year are given in the following table.
Month
Jan Feb Mar Apr May June July Aug
Demand
30 28 30 33 35 38 36 40
a) Use three -month moving average method to forecast the sales for
the months April through September Also compute the mean squared
error (MSE) based on the sales and forecasts for months April through
August
b) fthe forecast for January was 28. determine the forecast for sales for
the months February through September using an exponential
smoothing method with a= 0.60. Also compute the mean squared
error (MSE) based on the sales and forecasts for months April through
August.
c) Which method would you recommend based on MSE? Why?

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