Operations Management
11th Edition
ISBN: 9780132921145
Author: Jay Heizer
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 18DQ
How can we determine the probability that a project will be completed by a certain date? What assumptions are made in this computation?
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It is January 1 of year 0, and Merck is trying to determine whether to continue development of a newdrug. The following information is relevant. You can assume that all cash flows occur at the ends of therespective years.■ Clinical trials (the trials where the drug is tested on humans) are equally likely to be completed in year1 or 2.■ There is an 80% chance that clinical trials will succeed. If these trials fail, the FDA will not allow thedrug to be marketed.■ The cost of clinical trials is assumed to follow a triangular distribution with best case $100 million,most likely case $150 million, and worst case $250 million. Clinical trial costs are incurred at the end ofthe year clinical trials are completed.■ If clinical trials succeed, the drug will be sold for five years, earning a profit of $6 per unit sold.■ If clinical trials succeed, a plant will be built during the same year trials are completed. The cost of theplant is assumed to follow a triangular distribution with best case $1…
1) Under “Costs of Quality”, costs associated with quality can be classified into four categories: appraisal, prevention, internal failures, and external failures. The costs of quality for Corley Motors Logistics is given in the table.
Cost Elements
Amount
Checking outbound boxes for errors
$31,000
Quality planning
$10,625
Downtime due to conveyor/computer problems
$342,125
Incoming product inspection
$21,000
Customer complaint rework
$33,000
Correcting erroneous orders before shipping
$36,550
Quality training of associates
$25,925
Correction of typographical errors--pick tickets
$11,475
a) Classify the quality cost elements given in the table into the different quality cost categories (prevention, appraisal, internal failure, external failure).
b) Total the quality costs in each of the different quality cost categories (prevention, appraisal, internal failure, external failure).
c) Using a) and b), suggest which areas…
Note: In chapter 9, section 9.4 of the Stevenson text, the costs of quality are covered; chapter 9 Stevenson lecture power point slide 7 touches upon this topic; see lecture video, 3.55 mins to 4.54 mins.
2) The production process at Hansa Ceylon Coffee fills boxes with dark arabica coffee. The data for the fill weight (in ounces) of eight samples are presented below. A sample size of six was used. The firm’s operations analyst wants to construct X-bar and R-charts to monitor the filling process.
Sample
Sample Mean
Sample Range
1
15.80
0.42
2
16.10
0.38
3
16.02
0.08
4
15.95
0.15
5
16.12
0.42
6
16.18
0.23
7
15.87
0.36
8
16.20
0.40
a) Calculate the upper and lower control limits for the X-bar chart.
b) Calculate the upper and lower control limits for the R chart.
c) Is the process under control? Why or why not?
Note: In chapter 10, section 10.3 of the Stevenson text, control charts for variables are…
Chapter 3 Solutions
Operations Management
Ch. 3 - Give an example of a situation in which project...Ch. 3 - Explain the purpose of project organization.Ch. 3 - What are the three phases involved in the...Ch. 3 - What are some of the questions that can be...Ch. 3 - Define work breakdown structure. How is it used?Ch. 3 - What is the use of Gantt charts in project...Ch. 3 - What is the difference between an...Ch. 3 - What is the significance of the critical path?Ch. 3 - What would a project manager have to do to crash...Ch. 3 - Describe how expected activity times and variances...
Ch. 3 - Define earliest start, earliest Finish, latest...Ch. 3 - Students are sometimes confused by the concept of...Ch. 3 - What are dummy activities? Why are they used in...Ch. 3 - What are the three time estimates used with PERT?Ch. 3 - Would a project manager ever consider crashing a...Ch. 3 - How is the variance of the total project computed...Ch. 3 - Describe the meaning of slack, and discuss how it...Ch. 3 - How can we determine the probability that a...Ch. 3 - Name some of the widely used project management...Ch. 3 - The work breakdown structure (WBS) for building a...Ch. 3 - 3.2 Robert Day has decided to run for a seat as...Ch. 3 - Draw the activity-on-node (AON) project network...Ch. 3 - Given the activities whose sequence is described...Ch. 3 - 3.5 Using AOA, diagram the network described below...Ch. 3 - Stephen Hall is developing a program in supply...Ch. 3 - Task time estimates for the modification of an...Ch. 3 - 3.8 The City Commission of Nashville has decided...Ch. 3 - Refer to the table in Problem 3.8. a. Draw the AON...Ch. 3 - The activities needed to build a prototype laser...Ch. 3 - Dave Fletcher (see Problem 3.10) was able to...Ch. 3 - The activities described by the following table...Ch. 3 - A renovation of the gift shop at Orlando Amway...Ch. 3 - Kelle Carpet and Trim installs carpet in...Ch. 3 - The following is a table of activities associated...Ch. 3 - Assume that the activities in Problem 3.15 have...Ch. 3 - Bill Fennema, president of Fennema Hospitality,...Ch. 3 - What is the minimum cost of crashing the following...Ch. 3 - Three activities are candidates for crashing on a...Ch. 3 - Development of Version 2.0 of a particular...Ch. 3 - The estimated times and immediate predecessors for...Ch. 3 - Rich Cole Control Devices, Inc., produces...Ch. 3 - Four Squares Productions, a firm hired to...Ch. 3 - Using PERT, Adam Munson was able to determine that...Ch. 3 - Clark Products makes pizza ovens for commercial...Ch. 3 - The Tesla 6 is a new custom-designed sports car....Ch. 3 - TABLE 3.6 Southwestern University Project 1....Ch. 3 - TABLE 3.6 Southwestern University Project 2 What...Ch. 3 - TABLE 3.6 Southwestern University Project 3. If it...Ch. 3 - Project Management at Arnold Palmer Hospital Video...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - The equivalent of a new kindergarten class is born...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...Ch. 3 - At the Hard Rock Cafe, like many organizations,...
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