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operations management

Questions and Answers of Operations Management

In a multiple linear regression model with two independent variables, how would you interpret the regression coefficients b1 and b2?
In what ways is the MAPE superior to the other forecasting error measures discussed in this supplement?
The managers of Mayo Department Store want to evaluate the relationship between the sales of air conditioners and the average weekly temperature. The following weekly sales data along with the
Champion Auto Group believes that car sales are closely related to the amount of money the firm spends on advertising and the personal income levels of consumers in various target markets. The
A major shoe manufacturer is considering launching a brand new pair of running shoes. Before introducing the shoes to the market, the company wants to determine the impact the price and in-store
Based on 12 months of demand data, an apparel store generated the following forecasts using judgmental methods. Compute the tracking signals for the forecasts using ±4 MAD limits and comment
Multiple regression analysis in Excel produced the following tables:1. State the multiple regression equation.2. Interpret the meaning of the coefficients X1 and X2 in the table.3. Forecast the value
A market research analyst used multiple regression analysis to determine the impact of price and promotion on the sale of a new brand of cereal. The analyst collected data from three variables from
Euro Rail ridership during the summer months is believed to be closely related to the number of tourists visiting Europe. The following table shows the data on number of tourists and Euro Rail
A math instructor who teaches calculus at a university in Western Pennsylvania believes that there is a relationship between the number of optional homework problems that the students complete during
James Trott, the manager the fictitious Blue Line Trucking Company, wants to develop a forecasting model to predict the maintenance expenditures on the company€™s trucks. The manager
A company that produces protein bars used different forecasting techniques to predict demand for its protein bars. The actual demand and the forecasted demand for cases of protein bars using the two
Aarthi Medicals, a fictitious company, has been monitoring the sales of a health drink for diabetics. As the demand for the health drink has been steadily increasing, the owner of the store, Nicole
Great Lakes Blood Bank (fictional) is the primary supplier of blood to various hospitals in Erie County, Pennsylvania. The number of pints of the rare blood type AB- supplied by the blood bank to the
A company has observed the following demand during the past 10 months for one of its popular products:1. Plot these data on a graph. Do you observe any pattern such as trend, seasonal, cyclical, or
The following table shows demand for kidney transplants for the past 7 years at the fictitious Crescent General Hospital:1. Compute 3-month moving average forecasts for years 4 to 8.2. Compute
A marketing manager has determined that demand for his company€™s popular product in a region is a function of the size of the region€™s population in tens of thousands (x1),
1. Go to Oracle’s (Oracle Corporation, Redwood City, CA) website (https://www.oracle.com/index.html), and read about its software applications for retailers. Thousands of retail and wholesale
Explain the three types of waste (muri, mura, and muda) in your own words. Can you think of situations where you have seen each of these types of waste in jobs you have performed?
1. The quote at the end of this case seems to suggest that the technology of getting this innovative aircraft to fly was the easy part. Discuss why Boeing’s real challenges lie in the future rather
1. What are the main advantages of letting a company like TAL manage your inventory and reorder systems? What are the major disadvantages?2. How does TAL achieve integration in its supply chain? What
Compare the ideas of lean with the 5S framework. How do they complement each other? How do you see them as distinct approaches?
An autoglass company located in Detroit produces mirrors for automobiles. The company supplies auto mirrors to a nearby Ford (The Ford Motor Company, Dearborn, MI) plant. The demand for mirrors from
What are the main differences between push and pull systems? Which seems more difficult to manage? Why?
Why is production in small lot sizes essential to achieving lean?
Why is value stream mapping such a critical first step in a company’s move toward a lean approach to operations?
You have the following information:Demand rate = 250 units per hourLead time = 15 hoursContainer capacity = 300 unitsSafety stock = 20%1. Determine the number of Kanban cards required.2. Convert
What types of production processes are most conducive to developing a value stream map?
You have the following information:Demand rate = 500 units per hourLead time = 5 hoursContainer capacity = 60 unitsSafety stock = 15%1. Determine the number of Kanban cards required.2. Convert these
Why is uniform production an important element of lean, and how is it achieved?
How are lean thinking and Six Sigma related?
What are the advantages of lean services?
A bank in New Delhi, India, uses a Kanban system in its check processing facility. Each Kanban container holds 60 checks, requires 25 minutes to be processed, and spends 2.5 hours waiting to be
Which lean approaches work in both lean manufacturing and lean service operations?
Refer to Table 8.2 as a basis for this problem. This month€™s master production schedule calls for the production of 180 sandals, 120 dress shoes, and 80 sneakers per eight hour shift.1.
What are the elements in a lean supply chain? Why are transparent information and full collaboration two critical components of lean supply chains?
Dolphin Motors (not a real company) recently installed a mixedmodel production line at its plant in Bangalore, India. The sales of its minivans and SUVs have declined in recent months as a result of
Discuss briefly the key elements of lean logistics.
The Standard Herald Motor Company is a fictional producer of three types of vehicles/cars in a single assembly line: the sedan (S), the hatchback (H), and the SUV (V). The plant manager at Standard
You are the shift manager of a medium-sized restaurant. You would like to begin taking a lean production approach. Identify three changes you could make to institute a lean approach at the restaurant.
The fictitious Cool Air Inc. assembles three models (A, B, and C) of air conditioners. The production manager at Cool Air plant wants to implement uniform production and mixed-model scheduling. The
Suggest ways in which lean principles can be applied to a hospital.
Discuss why inventory management is needed to manage operations and supply chains effectively.
The text provides a set of inventory management metrics. Suppose you were put in charge of a small clothing store at your local mall specializing in summer and beach wear. Select three of the
1. Consider a sporting goods store and apply a type A, B, and C classification method to its inventory. What items are likely to turn over often as a result of seasonal demand?2. Tuesday Morning’s
Inventory management in the service sector is a critical function because services often include tangible items as inventory. Discuss how you might manage inventory at a large, multiscreen movie
1. Think of some aspects of inventory management discussed in this chapter (for example, inventory costs or cycle-stock patterns). How does online shopping affect them?2. How is omnichannel shopping
Identify the various types of inventory, and explain how they contribute to the operations function of an organization.
The text discusses four types of inventory. Select a business (not one given in the text), and identify examples of all four classes of inventory as they can be applied to that business.
What are the most common types of costs associated with inventory?
Safety stock is critical for smoothing out potential supply disruptions during reordering. Can you think of some businesses or product categories that require more safety stock than others? (Why
Why is inventory critical within supply chains?
Suppose you were a consultant working for the Wegmans (Wegmans Food Markets, Inc., Rochester, NY) grocery store organization and you were asked to advise the company on steps it could take to make
Identify some of the key metrics organizations used to assess how well their inventories are being managed.
Develop an ABC inventory classification system for a minimum of 20 items at your local Wal-Mart (or a similar general retail store). What criterion did you use for classifying the goods into either
What are the advantages and disadvantages of physically counting inventory?
Lynne Chappell manages the inventory of supplies in a large hospital. To determine which items should be closely monitored, Lynne decided to use the ABC classification scheme to group the items on
Norman Stark, Inventory analyst at fictional Grimault Industries, is considering the use of the ABC method of classifying inventory so that he can exercise better control over the critical items in
Explain the differences among inventory control systems. What are the advantages and disadvantages of each system?
Briefly explain the bullwhip effect. Why is it common in batchordering situations and for products with seasonal demand?
What steps can organizations take to minimize the bullwhip effect?
What are some strategies for making inventory systems sustainable?
Identify key issues related to managing inventory in the service sector.
Murali Aromatics Inc. is a fictional manufacturer of aromatic oils and perfumes. Demand for the company’s products has been increasing steadily for the past five years, and capacity of the existing
How has the rise in automation dramatically altered the ways in which an organization develops its flow of processes? Give examples of automation and the subsequent changes that have occurred in a
What do you see as advantages and disadvantages of do-it yourself process flows, such as self-checkout at grocery stores?
What is the difference between flow time and cycle time?
MegaTech is a fictional manufacturer of electronic products. Recent growth in the demand for the company€™s products requires it to invest in new production methods. The company has three
How would you characterize the primary goals of a product process design, and how would you differentiate these goals from those for a service process design, such as a hospital?
How does the variability in task times affect balancing a line?
Fly High Inc. is a fictional manufacturer of snowboards. The company has designed a new ski board and needs to choose a new production method. The process types the company can choose from and their
Explain the following manufacturing methods, and give an example of each one:1. Make-to-stock2. Assemble-to-order3. Make-to-order4. Engineer-to-order
Examine the service process design matrix in Figure 9.3. Identify at least two other businesses that would be classified in each of the four quadrants. What are the implications of these different
Why are rule-of-thumb approaches used to analyze layouts?
Alistair Cook€™s fictional machine shop has four work centers: I, II, III, and IV. The distances in feet between each pair of work centers are as follows.The loads moved between each pair
The point of postponement (POP) is a useful idea for developing manufacturing strategies. Explain why an organization needs to be aware of the decoupling point as it develops its supply chain
What are some constraints that layout analysts have to address in balancing a line?
A Chicago job-shop operates with four departments€”machining, drilling, assembly, and painting. The shop€™s production manager, Karen Grillo, has data on the distances between
Explain the three types of layouts, and give examples of products manufactured with these layouts:1. Process2. Product3. Fixed-position
How would you calculate the percentage of idle time in an assembly line that is balanced?
Trinity Hospital is planning to open a new clinic in Mylapore, Chennai, India. Based on historical data from similar facilities, the hospital€™s design committee collected the following
What are the advantages of cellular manufacturing layouts? What are their disadvantages?
A law firm has six departments and you are asked to prepare a layout for this law firm office. The distance between adjacent departments is 30 feet, and the number of trips between the departments is
List three principles that should affect the design and operations of a warehouse.
Visit a local restaurant, and analyze its layout. What do you see as some limitations or drawbacks with how the facility is laid out? What suggestions might you make for redesigning it?
The fictional Reliance Department Store is opening a new store in City Center Mall. Data from existing stores on customer movements between the departments are given in the following table. Design a
An operations manager wants to balance a line as efficiently as possible. The desired daily output rate is 60 units, and the line operates 9 hours a day. Given the precedence diagram, assign the
Assembling the subassembly of the landing gear of the Airbus A320 aircraft requires 13 tasks. The tasks, their precedence relationships, and task times as given in the following table. In addition,
Excelsior Technologies (not a real company) designs layouts for a variety of companies. Damien Motors, a fictional German automobile company, is planning to open an assembly line plant in Hamburg for
James Stuart & Associates, a fictional reputed law firm, is moving into a new facility. Historical data on employee movements per month among the six departments in the old office facility are
Voyage Enterprises is a fictional manufacturer of handcrafted leather suitcases and travel bags. Assembly of suitcases is a laborintensive process and requires completion of seven task elements shown
The following is a precedence diagram of tasks and their time in minutes to assemble a dresser:1. If 200 dressers are to be assembled in a 40-hour work week, what is the cycle time?2. Balance the
Hackers Golf Club Inc. (not a real company) is contemplating a new finish for the golf clubs it manufactures. Bernd Hacker, the company CEO, has come up with three choices:(a) Refurbish the old
Ergonomics Kitchen Cabinetry has designed a new Lazy Susan wooden cabinet and needs to choose a new production method. The process types the fictional company can choose from and their associated
Discuss why supplier management is important for both manufacturing organizations and service organizations.
A manager of a restaurant must choose between two suppliers for his primary food and cleaning supplies.1. What do you consider would be some of the critical factors on which to base the choice of
1. Take a position on the following statement: €œBoeing dug its own grave by outsourcing so much of the 787 to its supply chain. The firm could not possibly do an effective job managing so
Royal Enfield (Chennai, India) is a manufacturer of five models of motorcycles in the United States. All of the five models use the same engine but the engines will require special tooling during the
What are the goals of supplier management? Discuss how achieving those goals can improve a company’s supply chain performance?
Suppose, in Problem 1 above, the restaurant had a strong incentive to operate in sustainable ways and promote sustainable operations. How might you adjust the supplier scorecard to take into

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