Question: The Natural Beauty Co. develops, makes, and

> Charles Cycles produces bicycles and tricycles. The setup cost when switching production from one to the other is $1,000. On average, retail customers order 150 tri-cycles per day (consider a 250-day year). The daily production rate for tricycles is 600 

> Continuing with problem 26, one of the textbooks in your bookstore costs $100 and sells for $200. In this case, however, you cannot salvage any value from copies that do not sell because a new edition is published every semester. Demand for this text ave

> Chapter 6 introduced the case, “A Comment on Management Attitude.” Review that case from a Moment of Truth perspective. What are the key takeaways for you when this approach is applied? What recommendations would you make to the owners of Dinsmore’s hote

> Management is concerned about the operation of its 123XYZ work center. From past studies, it knows that x-bar is 12.14, the LCL is 11.74, and the UCL is 12.54. The following data were collected for a 20-day period (where each observation is the mean for

> Using the control chart developed in the previous problem, plot the following data received from the store for a 10-day period. What insights for management do you have based on your analysis?

> A store is concerned with the number of late shipments that it generates each day. Consequently, it decides to track the number of late shipments for the last seven days. The data are summarized in the list below. Calculate the LCL and UCL for this data

> Peerless Windows is a major manufacturer and installer of windows into new homes. Currently, management has found that it has experienced a large number of customer claims (about 15% of all orders placed) against Peerless. These customers, often builders

> Suppose that you collect data for 15 samples of 30 units each and find that, on average, 2.5 percent of the products are defective. What are the UCL and LCL for this process?

> Using the data from the preceding problem, the instructor in charge of these five classes strongly feels that the arrival patterns are strongly influenced by the class (i.e., the arrival rates vary by class). Do the data support this position? (Hint: Loo

> Calculate the Cp and Cpk for a process characterized by the following data: Production specifications: 1.00 ± 0.08 cm Process standard deviation: 0.005 cm Process distribution centered at 0.95 cm

> In an article in Quality Engineering, a research article presented individual measurement data on sand compactibility, as follows: For these data, the author reported that the lower and upper specifications for sand compactibility are 38 and 46, respect

> Frank owns and operates a company that installs audiovisual equipment for corporate clients. He is currently working on a job that must be completed in 17 days. However, the project is running behind (see the remaining task information below). Equipment

> Marty and Marge are renovating their house. They hope for all work to be completed before the Thanksgiving holiday, which is 55 days away. Given the data below, what is the probability that the house will be completed before Thanksgiving? Assume that onl

> Consider the following software development plan. a. The client has asked for an estimated completion date. What would you tell her? b. The client would like to have the completed software in 37 weeks. What is the likelihood that the critical path will

> Big Turkey Burger Farms (BTBF) produces a large turkey burger that is world famous. This burger is known not only for its quality, but also its size and consistency. BTBF produces a turkey burger that on average is 12 ounces (with a standard deviation of

> Jude and Pat Strohsal have a crack in their water line and need to replace it. This will require digging up the water line, replacing it, filling the hole, leveling the soil, and reseeding the grass. The Strohsals’ plumber suggests that

> Given the data in Table 15S-3, what is the probability that the project will be completed in 32 days or less? What is the probability that the project will take longer than 32 days?

> Annie is planning a large surprise party for her sister Gwendolyn. She has developed the plan below, including estimates of the time (in hours) and cost necessary to perform each of the activities required at the currently planned pace and at the crashed

> Consider the supply chain planning system installation project depicted in Figure 15S-1. Suppose that the client has offered a $4,000 bonus to us if we can complete the project seven working days early. Based upon the crash cost information provided in T

> In problem 1 we assumed that it would take Bill 30 minutes to get from the golf course to his office. Assume now that this is the most likely time, but traffic and other factors could make the commute time as little as 25 minutes or as much as 45 minutes

> Bill needs to schedule a meeting for tomorrow afternoon, but he also has a tee time for golf at 10:00 a.m. Bill usually finishes a round of golf in 4.25 hours. If the course is empty and he doesn’t spend too much time looking for lost balls, he can finis

> Given the following project network: a. Identify the critical path and the earliest start and finish dates for each task. b. Calculate the slack for every project activity. c. Draw this network as a Gantt chart.

> Based on the precedence table below, draw a network diagram for this project. Identify the critical path, the earliest start and finish dates, and the slack for each task.

> Consider the following table of precedence relationships for a portion of a house-building project: a. Draw a network diagram for this project and identify the critical path. b. What assumptions may have been made in the development of the time estimate

> Consider the following information about a small project: a. Draw a network diagram. b. Identify the critical path, the earliest start and finish dates, and the slack for each task. c. Which of these activities should the project manager track most clos

> As a result of a Six Sigma exercise, the process described in the preceding question has been modified. Data have been collected again and summarized in the following table. To what extent have the improvements introduced by the process modification been

> Suppose that you and two other students are working on a team research project for a course you are taking. To complete the project, you expect that the three of you will need to work together on reviewing related literature for about five days. Then, yo

> For the following network, answer the questions below. (Times shown are in days.) a. What is the length of the critical path? b. What are the earliest and latest start dates for task E? c. What is the latest start date for task B? d. If all other tasks

> For the following simple set of project tasks, answer the questions below. (Task times are shown in hours.) a. What is the expected time that all five tasks will be completed? b. What is the earliest start date for task C? c. What is the latest start da

> Somewhere in the United States, committee members in a voting precinct have decided to conduct a vote recount following an election. They have developed a preliminary WBS and have asked you to critique it. What are the weaknesses of this WBS?

> Given the project data below, which activities are critical and what is the length of the critical path? If activity E is reduced by 2 days, what additional activities become critical?

> Professor Bill is planning to launch a new research project that he hopes will culminate in a high quality published article. He and his collaborators have identified the research steps below. Bill will be considered for tenure in 18 monthsâ€&

> Given the network in problem 9, enter project data into a project management software program such as MS Project. Print a network and a bar chart (Gantt) view. Interpret the results.

> Suppose that you have been given the task of organizing a graduation open house party for your younger brother who is graduating from high school. Write an objective statement and develop a WBS for the project, with at least three levels of detail. Write

> Based on the BOM shown below, how many of part J will be needed if 40 units of end item A are needed? Managers have decided to outsource part G. Revise the BOM for end item a, assuming that item G is now purchased from a supplier. How many of part J will

> Using the information in problem 7, develop an indented BOM.

> Michigan State Figurine Inc. (MSF) sells crystal figurines to Spartan fans. MSF buys the figurines from a manufacturer for $10 per unit. It sends orders electronically to the manufacturer, costing $20 per order, and it experiences an average lead time of

> Based on the BOM shown below, how many of part D will be needed if 100 units of end item A are needed? How many of part F will be needed?

> Develop an indented BOM for the product structure tree shown in problem 4.

> Based on the BOM in problem 4, what is the cumulative lead-time for end item A?

> Based on the BOM shown below, how many units of part F will be needed if 15 units of end item A are needed? If the company decided to purchase part D from suppliers, how would the BOM change? Assuming part D is purchased, how many units of part F are nee

> Develop an indented BOM for the product structure tree in problem 1.

> Calculate the processing load and available capacity and develop a load profile for a baby stroller assembly process. The assembly process for baby strollers takes 18 minutes and the assembly line has five employees who work eight hours per day. What con

> Calculate the processing load and available capacity and develop the load profile for a dishwasher. Eight employees work the assembly process for 40 hours per week each. As the planner, what concerns do you have and what changes would you make (if any)?

> Calculate the processing load and available capacity and develop the load profile for the stereo speaker subassembly. Two employees work the assembly process for 40 hours each per week. As the planner, what concerns do you have and what chang

> Based on the BOM in problem 1, what is the cumulative lead time for end item A? How will this information be used?

> Calculate the processing load and develop the load profile for the computer assembly process. As the planner, what concerns do you have (if any)? What changes might you consider?

> Construct an X bar – R chart for the following data set.

> The computer keyboard assembly area has five employees who work 40 hours each week. Use this information to develop a load profile. What are your recommendations?

> Given the BOM and MPS for end items A and B shown below, complete the MRP schedules for items A, B, C, F, and G. MPS

> Given the BOM and MPS for end items A and B shown below, complete the MRP schedules for items A, B, C, D, and E. MPS

> Based on the BOM and the MPS for end item A shown below, complete the MRP schedule for items A, C, D, and E. MPS

> Complete the MRP record for a bicycle seat.

> Complete the MRP record for a bicycle frame using an L4L lot-sizing strategy. Considering the lead time, where should scheduled receipts be shown? Repeat using a fixed order quantity of 100 frames. Again, show scheduled receipts. Compare and contrast the

> Draw a product structure tree for the patio planter using the BOM below. If there are plans to make eight patio planters, how many bolt and nut sets will be needed?

> Draw a product structure tree for the baking pan using the BOM shown below. If there are plans to make 100 baking pans, how many handles are needed? How many bolt and nut sets are needed?

> Using the BOM shown below, how many of part E will be needed if 20 units of end item A are needed? How many of part C will be needed?

> For the following check sheet, assume that o indicates a surface scratch, x a blowhole, D a defective finish, and * improper shape. How would you go about analyzing the following check sheet?

> Togo makes riding lawn mowers and tractors. The company expected quarterly demand is given below in the chart. The company will have 300 mowers in inventory at the beginning of the quarter and desires to maintain at least that number at the end of each q

> Appliances Inc. is preparing an aggregate production plan for washers for the next four months. The company has expected monthly demand is given below in the chart. The company will have 500 washers in inventory at the beginning of the month and desires

> Trexoid Inc. makes a popular video game console. Demand varies each month, with highest demand coming in the last quarter of the year. Regular production costs are $120 per unit and inventory-carrying cost is $5 per unit per quarter. Overtime production

> JokersRWild makes playing cards in several different styles, but a “standard” deck of cards is used for planning purposes. The average worker at JokersRWild can make 10,000 decks of cards per month at a cost of $1.00 p

> A firm must plan production for the next six months. Each unit costs $250 to produce and has an inventory holding cost of $10 per unit per month based on ending inventory levels. The cost to hire a worker is $100, and the cost to fire a worker is $200 pe

> The current aggregate demand requirements for a firm are shown below for the next six months: The firm always plans to meet all demand. The firm currently has 120 workers capable of producing 120 units in a month (1 unit/worker). The workforce can be in

> The Johnson Company manufactures expensive medical diagnostic equipment. It plans to meet all of its projected demand (given below for the next year by quarter). The firm plans to use a constant production rate of 300 units/quarter. Production costs are

> Using the existing data in the solved problem (Neal Industries), assume that the overtime production wage rate is $24.00 per hour. Compute the cost of a chase plan using a stable workforce of 300 workers.

> Make-Believe-You is a company that produces “cosplay” costumes for those people who want to live like their favorite action heroes. Currently, out of its catalog of hundreds of costumes, Make-Believe-You has identified

> Dale’s Dance Studio currently has three full-time instructors who are each paid $2,500 per month. A dance instructor can work a maximum of only 100 hours per month because instruction normally takes place at night. Instructors receive $

> Use the data in problem 10 to create a Pareto diagram.

> Jones Inc. is preparing an aggregate production plan for next year. The company expects demand to be 1,000 units in quarter 1; 2,000 units in quarter 2; 4,000 units in quarter 3; and 3,000 units in quarter 4. The company will have 100 units in inventory

> For the Sodas Galore problem discussed in the chapter, assume that employees negotiate an increase in the regular production wage rate to $24.00 per hour and $36.00 per hour for overtime. Rework all aspects of the problem using the new wage rates.

> A ski repair shop at a resort in Colorado sells replacement poles each season. The shop needs to develop a forecast of next season’s sales so that they can place an order for poles with their supplier well in advance of the beginning of

> The owner of an on-line video rental service has recorded the following rentals each week: a. Use a 3 week moving average to forecast sales for each of the weeks 4 through 9. b. Use a 4 week moving average to forecast sales for each of the weeks 5 throu

> Using α= 0.5 and the data below, compute exponential smoothing forecasts for periods 2 through 8.

> Assume that you are the production manager for Fast Current Kayaks of Washington State. One of the products that you make and sell is the “Fast Current” sea touring kayak paddle). You are responsible for ensuring tha

> You have become concerned about the amount of copier paper used in your office after repeatedly running out of supplies. Your assistant keeps track of the number of reams (packages of 500 sheets) for 24 weeks: a. Compare the effectiveness of two-week, f

> Use the Excel spreadsheet that accompanies this chapter to evaluate different forecasting models using the ice cream sales data. Try the following parameters for the moving average and simple exponential smoothing models; n=1, 4, 8; alpha = 0.1, 0.5, 0.9

> If last period’s forecast was 27 and the demand was 30, what was the forecast error? What would be the forecast for the next period using an exponential smoothing model with alpha = 0.5?

> Given the data in the table below: a. Compute the forecast for period 12 using a causal regression model and assuming that oil price for period 12 is 65. b. Create a graph of the gasoline sales and oil price data and include a line representing the regr

> Use the data in problem 9 to create a Pareto diagram

> Re-solve problem 20 above using a simple exponential smoothing model with =.8, and with a 2-period moving average model. Which model is best?

> Given the data shown below, use α = .1 and β = .2 to create a trend enhanced smoothing based forecast for period 6. Assume that FIT1 = 20 and T1 = 3.

> Given the series of demand data below a. Calculate the forecasts for periods 7 through 11 using moving average models with n=2, n=4, and n=6. b. Calculate the Bias and MAD for each set of forecasts. Which moving average model is best?

> Use the Excel spreadsheet that accompanies this Supplement to evaluate different forecasting models using the ice cream sales data. a. Which model, time series regression, causal regression using temperature, or trend enhanced exponential smoothing, give

> Assume that the following demands vary according a four period seasonal cycle. a. Compute the seasonal indexes using the average demand in each cycle as the base. b. Compute the seasonal indexes using regression estimates as the base. c. How do the answ

> Many supply managers use a monthly reported survey result known as the purchasing managers' index (PMI) as a leading indicator to forecast future sales for their businesses. Suppose that the PMI and your business sales data for the last 10 months are the

> Wamaco Corporation uses the same simple exponential smoothing forecasting model for all of its products. The model has yielded the following weekly forecasts: a. What value of α is Wamaco Corp. using in its forecasting model? b. Calculate

> Calculate the slope and intercept for the data in the question 1 using simple linear regression. You may want to use an Excel spreadsheet to check your answer.

> Repeat problem 13 using (=.4 and β =.8. Which model gives a better approximation of the demand pattern for periods 1 through 6?

> Given the data shown below, use (=.2 and β =.4 to create trend enhanced smoothing based forecasts for periods 7, 8, and 9. Assume that FIT1 = 22 and T1 = 7.83.

> The quality inspectors at Windows Inc. visually inspect each sheet of 4 ft × 8 ft glass when it is through with the annealing process. They record all of the defects onto a form. The defects that have been found this week are given in the ta

> The time students entered the classroom of OM 390, Introductory Operations Management, was recorded by the professor in the table below for five class meetings. Create and analyze a histogram of these data. Please note that a negative time means that the

> One of the biggest changes in higher education in recent years has been the growth of online universities. The Online Education Database is an independent organization whose mission is to build a comprehensive list of the top accredited online colleges.

> The following results come from two independent random samples taken of two populations. Sample 1 ………………………… Sample 2 n1 = 50 …………………………….. n2 = 35 x̅ 1 = 13.6 …………………………. x̅2 = 11.6 σ1 = 2.2 …………………………….. σ 2 = 3.0 a. What is the point estimate of the

> Consider the following hypothesis test: H0: µ ≥ 20 Ha: µ < 20 A sample of 50 provided a sample mean of 19.4. The population standard deviation is 2. a. Compute the value of the test statistic. b. What is the p-value? c. Using α = .05, what is your conclu

> Suppose a new production method will be implemented if a hypothesis test supports the conclusion that the new method reduces the mean operating cost per hour. a. State the appropriate null and alternative hypotheses if the mean cost for the current produ

> Carpetland salespersons average $8000 per week in sales. Steve Contois, the firm’s vice president, proposes a compensation plan with new selling incentives. Steve hopes that the results of a trial selling period will enable him to conclude that the compe

> The label on a 3-quart container of orange juice states that the orange juice contains an average of 1 gram of fat or less. Answer the following questions for a hypothesis test that could be used to test the claim on the label. a. Develop the appropriate

> According to the National Beer Wholesalers Association, U.S. consumers 21 years and older consumed 26.9 gallons of beer and cider per person during 2017. A distributor in Milwaukee believes that beer and cider consumption are higher in that city. A sampl

> Consider the following hypothesis test. H0: µ = 20 Ha: µ ≠ 20 A sample of 200 items will be taken and the population standard deviation is σ = 10. Use α = .05. Compute the probability of making a Type II error if the population mean is: a. µ = 18.0 b. µ