Operations Management
13th Edition
ISBN: 9780136860419
Author: Lee Krajewski
Publisher: Pearson Education
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Textbook Question
Chapter 3, Problem 18P
A renovation of the gift shop at Orlando Amway Center has six activities (in hours). For the following estimates of a, m, and b, calculate the expected time and the standard deviation for each activity:
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Entriken Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Dick Entriken, president of Entriken Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. Dick is contemplating the construction of a machine that could harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the accompanying table.
----------------------------------------------
Activity Immediate Time (weeks)
predecessor
---------------------------------------------
A - 6
B - 5
C A 3
D A 2
E…
Chapter 3 Solutions
Operations Management
Ch. 3 - Prob. 1EDCh. 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 - Prob. 20DQCh. 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 - Task time estimates for the modification of an...Ch. 3 - The activities needed to build a prototype laser...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 - 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 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 8PCh. 3 - Prob. 13PCh. 3 - Prob. 15PCh. 3 - Prob. 17PCh. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 28PCh. 3 - Prob. 33PCh. 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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- The table below contains data for the installation of new equipment in a manufacturing process at Excello Corporation. Your company is responsible for the installation project. Indirect costs are $12,000 per week, and a penalty cost of $6,000 per week will be incurred by your company for every week the project is delayed beyond week 12. Activity A B с D E F G Immediate Predecessor(s) AB Activity A B с D A C D, E E Normal Time Crash Time (weeks) (weeks) 3 1 2 2 1 3 4 1 6 3 Time according to schedule (weeks) 1 a. What is the shortest time duration for this project regardless of cost? The shortest project duration regardless of cost is 9 weeks. (Enter your response as a whole number.) b. What is the minimum total cost associated with completing the project in 12 weeks? The minimum total cost to complete the project in 12 weeks is $ 203500. (Enter your response as a whole number.) c. What is the total time of the minimum-cost schedule? (Enter your responses as whole numbers.) The total…arrow_forwardEntriken Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Dick Entriken, president of Entriken Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. Dick is contemplating the construction of a machine that could harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the accompanying table. ---------------------------------------------- Activity Immediate Time (weeks) predecessor --------------------------------------------- A - 6 B - 5 C A 3 D A 2 E…arrow_forwardEntriken Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Dick Entriken, president of Entriken Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. Dick is contemplating the construction of a machine that could harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the accompanying table. ---------------------------------------------- Activity Immediate Time (weeks) predecessor --------------------------------------------- A - 6 B - 5 C A 3 D A 2 E…arrow_forward
- Entriken Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Dick Entriken, president of Entriken Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. Dick is contemplating the construction of a machine that could harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the accompanying table. ---------------------------------------------- Activity Immediate Time (weeks) predecessor --------------------------------------------- A - 6 B - 5 C A 3 D A 2 E…arrow_forwardThe product development group at “Griffin” Company has already worked on new computer software products that has potential to know a large market share. Via an outside source, London Management has learned that a competitor is working to bring a similar product to market. As a result, London's top management increased its pressure on the product development group. Group leaders have turned to CPM / PERT as an aid to scheduling remaining activities before new products can be brought to market. The estimated time of activity in a day is as follows a.Create the the network if it is accelerated according to the schedule above b.Find the cost and the duration c.Determine the path and critical activitiesarrow_forwardThe product development group at “Griffin” Company has already worked on new computer software products that has potential to know a large market share. Via an outside source, London Management has learned that a competitor is working to bring a similar product to market. As a result, London's top management increased its pressure on the product development group. Group leaders have turned to CPM / PERT as an aid to scheduling remaining activities before new products can be brought to market. The estimated time of activity in a day is as follows Question: Create an initial network Find the cost and the duration Determine the path and critical activitiesarrow_forward
- The Mobicom Corporation is in the design phase of a system project. The project manager wants to develop a network analysis diagram to plan the activities of designing the system outputs. The activities are as follows. ACTIVITY PRECEDING TIME[WEEKS] A ----- 5 B ---- 6 C ---- 4 D A,B 7 E C 8 F C,D 10 G D 8 Required Draw a network diagram for the design phasearrow_forwardThe table below contains data for the installation of new equipment in a manufacturing process at Excello Corporation. Your company is responsible for the installation project. Indirect costs are $12,000 per week, and a penalty cost of $8,000 per week will be incurred by your company for every week the project is delayed beyond week 12. Activity Immediate Predecessor(s) A B с D E F G || D, E Normal Time Crash Time Normal Cost (weeks) ($) 3 7,000 2 3,000 3 12,000 4 12,000 1 8,000 6 5,000 3 9,000 (weeks) 1 2 1 3 1 4 2 D Crash Cost ($) 14,000 3,000 40,000 22,000 8,000 13,000 16,000arrow_forwardTo complete the rotor assembly for an experimental spacecraft, Gilbert has laid out nine major activities involved. These activities have been labelled A to I in the table below, which also shows their estimated completion times (in weeks) and their immediate predecessors. EVENTS AND ACTIVITIES FOR ROTOR ASSEMBLY ACTIVITIES TIMES (IN WEEKS) PRECEDING EVENT A M B A 1 2 3 - B 2 3 4 A C 4 5 6 A D 8 9 10 A E 2 5 8 B F 4 5 6 B, C G 1 2 3 F, D H 1 3 5 E, F I 2 4 6 H, G Key: A is optimist time, M is the most likely time and B is the pessimistic time. a) Calculate the expected time for each activity b) Draw a Gantt Chart from the same information above c) State the critical path and the maximum number of weeks the project will take to be completed. d) Discuss the pros and cons of using the Gantt chart as a planning and scheduling tool?arrow_forward
- Dr. Ell has been given a budget of $5,000 to organize a conference at her university in less than 2.5 months' time (9 weeks) via an educational grant. She has a team of 2 research assistants and after some deliberation, they identified the following activities that are required to be completed for hosting a successful conference. Immediate Predecessor Activity A B с D E F G H Description Deciding Dates and Number of sessions Determining Venue for conference Sending out a Call for Papers Inviting Special Speakers Responding to presenters Organizing Sessions with papers Getting registrations and confirmations Last minute Edits and Finalizing Program Dr. Ell has approached you, her student, to help her figure this out, as a part of her Management Science class assignment. Please give your respo with appropriate explanations, tables, and formulas, where relevant, to the following questions: BUAE U H 000000 1. PART 1. PERT/CPM with varying times a. Follow a PERT/CPM model to identify the…arrow_forwardDraw activity Diagram for this scenario.When a customer calls the Agent on the phone, they are asked about the Arrival date and time, and the Destination city. The agent then informs the customer about the available route timings. The customer then selects the appropriate route timings and number of seats he wants to reserve. The agent confirms if seats are available, then asks the customer for his name and phone number. Finally, the agent informs to the customer about successful reservation. "When a customer calls the Agent on the phone, they are asked about the Arrival date and time, and the Destination city. The agent then informs the customer about the available route timings. The customer then selects the appropriate route timings and number of seats he wants to reserve. The agent confirms if seats are available, then asks the customer for his name and phone number. Finally, the agent informs to the customer about successful reservation"arrow_forwardUnder the ZY company’s current warehouse operation, warehouse clerk dispatch order-picking personnel to fill each order and have the goods moved to the warehouse shipping area. Because of the high labour costs and relatively low productivity of hand order-picking, management has decided to automate the warehouse operation by installing a computer-controlled order system, along with a conveyor system for moving goods from storage to the warehouse shipping area. ZY’s director of material management has been named the project manager in charge of automated warehouse system. After consulting with members of the engineering staff and warehouse management personnel, the director compiled a list of activities associated with the project. The optimistic, most likely, and pessimistic times (in weeks) have also been provided for each activity, as shown below. Activity A B C D E F G H I J K Description Determine equipment needs Obtained Vendor proposals Select Vendor Order system Design…arrow_forward
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