Operations Management Final Exam
Which of the following is NOT one of the successful techniques for controlling the cost of labor in services? A) accurate scheduling of labor-hours to assure quick response to customer demand B) an on-call labor resource that can be added or deleted to meet unexpected demand C) little flexibility in worker hours to decrease the burden on management D) flexibility of individual worker skills that permits reallocation of available labor E) flexibility in rate of output or hours of work to meet changing demand
C) little flexibility in worker hours to decrease the burden on management
Top executives tend to focus their attention on which type of forecasts? A) short-range B) intermediate-range C) long-range D) weather E) the forecast for the next day's absentee levels
C) long-range
The number of late insurance claim payouts per 100 should be measured with what type of control chart? A) x-bar chart B) R-chart C) p-chart D) c-chart E) either p-chart or c-chart
C) p-chart
Which of the following aggregate planning options is NOT associated with manipulation of product or service demand? A) price cuts or discounts B) promotion C) subcontracting D) counterseasonal products or services E) advertising
C) subcontracting
A newspaper boy is trying to perfect his business in order to maximize the money he can save for a new car. Daily paper sales are normally distributed, with a mean of 100 and standard deviation of 10. He sells papers for $0.50 and pays $0.30 for them. Unsold papers are trashed with no salvage value. How many papers should he order each day?
C_s=$0.50-$0.30=$0.20 C_o=$0.30 mean = 100 S.D. = 10 Service Level = C_s/(C_s+C_o) Service Level = .2/(.2+.3) Service Level = $0.4 Optimal Stocking Level = m +Z(SD) =~98
**CALCULATION** EOQ: Economic Order Quantity A certain type of computer costs $1,000, and the annual holding cost is 25% of the value of the item. Annual demand is 10,000 units, and the order cost is $150 per order. (Assume 250 working days per year) D = _______________ S = _______________ H = _______________ Q* = ______________ Total cost = ____________ Expected number of orders per year =_______________ Expected time between orders = ________________
D (Demand)= 10,000 units S (Ordering Cost)= $150 H (Holding Cost)= $1,000x.025=*$250* Q*(Optimal # of units per order)= Sqrt[(2DS)/(H)]= Sqrt[(2x10,000x$150)/$250)]=Sqrt(12,000)=109.54 --> Round up to [110 units] Total cost = (D/Q)S+(Q/2)H= [(10,000/110)x(150)]+[(110/2)x(250)]=*$27,386* Expected number of orders per year = N = Demand/Order Quantity 10,000/110=*90.91 orders* Expected time between orders = T = (# Working Days) / (Expected # of orders N)=250/90.91=*2.75 days*
***On Exam*** The assumptions of the production order quantity model are met in a situation where annual demand is 3650 units, setup cost is $50, holding cost is $12 per unit per year, the daily demand rate is 10 and the daily production rate is 100. What is the production order quantity for this problem? D = ________________ S = ________________ H = ________________ p = ________________ d = ________________ 𝑄_𝑝^∗= ________________ t = _________________
D = 3,650 S = $50 H = 12 p = 100 d = 10 𝑄_𝑝^∗= (plug into formula) =sqrt[(2DS/H[1-(d/p)]) =sqrt([2(3,650*$50)/$12[1-(10/100)]) =sqrt(365000/$12*0.9) =sqrt(365000/10.8) =*~184* t = Q/p = 184/100 = 1.84 days
Chris Beehner Electronics stocks toy remote control flying drones. Recently, the store has been offered a quantity discount schedule for these drones. Furthermore, setup cost is $200 per order, annual demand is 5,200 units, and annual inventory carrying charge as a percent of cost, I, is 28%. What order quantity will minimize the total inventory cost? (Insert Table from 12-3-5)
D = 5200 S = 200 I = .28 P = $96 or $98 or $100 Step 1: P = $96 EOQ=sqrt([2*5200*200]/[.28*96])= 278 units --> Range of 1,500 or higher? --> No, this is not feasible (so move on to next price range) P=$98 EOQ=sqrt([2*5200*200]/[.28*98])= 275 units --> In the range of 200 to 1499? *--> Yes, this is feasible* Step 2: Total Cost = (D/Q)S+(Q/2)*IP*PD Option 1: $98 275 = 5200/275(200)+275/2(.28)(98)+(98)(5200) = 517,155 Option 2: $96 1500=5200/1500(200)+1500/2(.28)(96)+(96)(5200) = 520,053 -->Go with lowest cost. *Answer*: Buy 275 drones at $98 per unit
Which of the following statements about ABC analysis is FALSE? A) ABC analysis is based on the presumption that controlling the few most important items produces the vast majority of inventory savings. B) In ABC analysis, "A" items should have tighter physical inventory control than "B" or "C" items have. C) In ABC analysis, forecasting methods for "C" items may be less sophisticated than for "A" items. D) ABC analysis is based on the presumption that all items must be tightly controlled to produce important cost savings. E) Criteria other than annual dollar volume, such as high holding cost or delivery problems, can determine item classification in ABC analysis.
D) ABC analysis is based on the presumption that all items must be tightly controlled to produce important cost savings.
Dependent demand and independent demand items differ in that: A) for any product, all components are dependent-demand items. B) the need for independent-demand items is forecast. C) the need for dependent-demand items is calculated. D) All of the above are true. E) None of the above is true.
D) All of the above are true.
A manager tells her production employees, "It's no longer good enough that your work falls anywhere within the specification limits. I need your work to be as close to the target value as possible." Her thinking is reflective of: A) internal benchmarking. B) Six Sigma. C) ISO 9000. D) Taguchi concepts. E) process control charts.
D) Taguchi concepts.
Revenue (or yield) management is best described as: A) a situation where management yields to labor demands. B) a situation where the labor union yields to management demands. C) a process designed to increase the rate of output. D) allocation of scarce resources to customers at prices that will maximize revenue. E) management's selection of a product mix yielding maximum profits.
D) allocation of scarce resources to customers at prices that will maximize revenue.
Enterprise resource planning (ERP): A) seldom requires software upgrade or enhancement. B) does not integrate well with functional areas other than operations. C) is inexpensive to implement. D) automates and integrates the majority of business processes. E) all of the above
D) automates and integrates the majority of business processes.
The number of defects after a hotel room cleaning (sheets not straight, smears on mirror, missed debris on carpet, etc.) should be measured using what type of control chart? A) x-bar chart B) R-chart C) p-chart D) c-chart E) either x-bar chart or R chart
D) c-chart
Which of the four major categories of quality costs is particularly hard to quantify? A) prevention costs B) appraisal costs C) internal failure costs D) external failure costs
D) external failure costs
When sample measurements falls inside the control limits, it means that: A) each unit manufactured is good enough to sell. B) the process limits cannot be determined statistically. C) the process output exceeds the requirements. D) if there is no other pattern in the samples, the process is in control. E) the process output does not fulfill the requirements.
D) if there is no other pattern in the samples, the process is in control.
A firm uses the chase strategy of aggregate planning. It produced 1000 units in the last period. Demand in the next period is estimated at 800, and demand over the next six periods (its aggregate planning horizon) is estimated to average 900 units. At the current time, which of the following tactics would be most representative of following a chase strategy? A) add 100 units to inventory in the next period B) add 200 units to inventory in the next period C) hire workers to match the 100-unit difference D) lay off workers to match the 200-unit difference E) implement a lower price point to increase demand
D) lay off workers to match the 200-unit difference
Which of the following would NOT generally be a motive for a firm to hold inventories? A) to decouple various parts of the production process B) to provide a selection of goods for anticipated customer demand and to separate the firm from fluctuations in that demand C) to take advantage of quantity discounts D) to minimize holding costs E) to hedge against inflation
D) to minimize holding costs
Which of the following aggregate planning strategies is known to lower employee morale? A) yield management B) counterseasonal product and service mixing C) changing inventory levels D) varying work force size by hiring or layoffs E) back ordering during high demand periods
D) varying work force size by hiring or layoffs
Techniques for building employee empowerment include: A) building communication networks that include employees. B) developing open, supportive supervisors. C) moving responsibility from both managers and staff to production employees. D) building high-morale organizations. E) All of the above are techniques for employee empowerment.
E) All of the above are techniques for employee empowerment.
Which of the following statements regarding the reorder point is TRUE? A) The reorder point is that quantity that triggers an action to restock an item. B) There is a reorder point even if lead time and demand during lead time are constant. C) The reorder point is larger than d × L if safety stock is present. D) A shorter lead time implies a smaller reorder point. E) All of the above are true.
E) All of the above are true.
An x-bar control chart was examined and no data points fell outside of the limits. Can this process be considered in control? A) Not yet, there could be a pattern to the points. B) Not yet, the R-chart must be checked. C) Not yet, the number of samples must be known. D) Yes. E) Both A and B
E) Both A and B
If the standard deviation of demand is six per week, demand is 50 per week, and the desired service level is 95%, approximately what is the statistical safety stock? A) 8 units B) 10 units C) 16 units D) 64 units E) Cannot be determined without lead time data.
E) Cannot be determined without lead time data. Missing information: Standard deviation *During Lead Time*
Which of the following statements regarding aggregate planning in services is FALSE? A) Approaches to aggregate planning differ by the type of service provided. B) Some service organizations conduct aggregate planning in exactly the same way as manufacturing firms, but with demand management taking a more active role. C) Aggregate planning in some service industries may be easier than in manufacturing. D) Labor is the primary aggregate planning vehicle. E) Level scheduling is far more common than using a chase strategy.
E) Level scheduling is far more common than using a chase strategy.
What is a popular measurement scale for service quality that compares service expectations with service performance? A) COQ B) SPC C) KAIZEN D) SERVQUAL E) TQM
E) TQM
Which of the following is not a typical inspection point? A) upon receipt of goods from your supplier B) when production or service is complete C) before the product is shipped to the customer D) at the supplier's plant while the supplier is producing E) after a costly process
E) after a costly process
ABC analysis divides on-hand inventory into three classes, generally based upon which of the following? A) item quality B) unit price C) the number of units on hand D) annual demand E) annual dollar volume
E) annual dollar volume
Effective use of MRP and other dependent demand models does not require which of the following? A) master production schedule B) bill of materials C) inventory availability D) lead times E) cost of individual components
E) cost of individual components
An aggregate plan satisfies forecast demand by potentially adjusting all EXCEPT which of the following? A) production rates B) labor levels C) inventory levels D) overtime work E) facility capacity
E) facility capacity
Which of the following is NOT an input to S&OP? A) capacity decisions B) supply-chain support C) workforce D) inventory on hand E) master production schedule
E) master production schedule
Which category of inventory holding costs has a much higher percentage than average for rapid-change industries such as PCs and cell phones? A) housing costs B) material handling costs C) labor cost D) investment costs E) pilferage, scrap, and obsolescence
E) pilferage, scrap, and obsolescence
Which of the following should be higher in P systems than Q systems? A) lead time B) demand C) order size D) order spacing E) safety stock
E) safety stock
What refers to training and empowering frontline workers to solve a problem immediately? A) just-in-time B) poka-yoke C) benchmarking D) kaizen E) service recovery
E) service recovery
Consider the following product structure. If the demand for product A is 50 units, how many units of components *C and E* will be needed? (Insert Drawing from 14-17)
(Insert drawing done in notebook) Answer: C=250; E=500
Product X: It is week 1 and there are currently 20 units in stock. We need 300 units at the start of week 5. If there are scheduled receipts planned for week 3 and week 4 of 120 each. Product X has a lead time of 1 week. When and how large of an order should be placed to meet the requirement of 300? A) Week 1, 300 units B) Week 1, 40 units C) Week 5, 40 units D) Week 4, 40 units E) Week 4, 300 units (Insert Chart in 14-27)
(Insert drawing done in notebook) Answer: D) Week 4, 40 units
True or False? A p-chart is appropriate to plot the number of typographic errors per page of text.
False
True or False? If the process average is in control, then the process range must also be in control.
False
True or False? The purpose of process control is to detect when natural causes of variation are present.
False
True or False? Work-in-process inventory is devoted to maintenance, repair, and operating materials.
False
True or False? Insurance and taxes on inventory are part of the costs known as setup or ordering costs.
False; Holding Cost
Lead time for a product is 4 days. Demand during this period averages 100 units per day. What would be an appropriate reorder point? ________________
4*100= *400 Units*
A Six Sigma program has how many defects per million? A) 3.4 B) 34 C) 1000 D) 6 times the standard deviation E) 2700
A) 3.4
A specific product has demand during lead time of 100 units, with a standard deviation during lead time of 25 units. What safety stock (approximately) provides a 95% service level? A) 41 B) 55 C) 133 D) 140 E) 165
A) 41 z=1.645 ss = 1.645 * 25
Which of the following items is mostly likely managed using a single-period order model? A) Christmas trees B) canned food at the grocery store C) automobiles at a dealership D) metal for a manufacturing process E) gas sold to a gas station
A) Christmas trees
PDCA, developed by Shewhart, stands for which of the following? A) Plan-Do-Check-Act B) Plan-Develop-Check-Accept C) Problem-Develop Solution-Check-Act D) Problem-Do-Continue-Act E) Prepare-Develop-Create-Assess
A) Plan-Do-Check-Act
A production manager at a pottery factory has noticed that about 70 percent of defects result from impurities in raw materials, 15 percent result from human error, 10 percent from machine malfunctions, and 5 percent from a variety of other causes. This manager is most likely using: A) a Pareto chart. B) a scatter diagram. C) a quality loss function. D) a cause-and-effect diagram. E) a flowchart.
A) a Pareto chart.
What directly results from disaggregation of an aggregate plan? A) a master production schedule B) priority scheduling C) a transportation matrix D) a capacity-demand matrix E) detailed work schedules
A) a master production schedule
"Quality lies in the eyes of the beholder" is: A) a user-based definition of quality. B) a manufacturing-based definition of quality. C) a product-based definition of quality. D) the definition of quality proposed by the American Society for Quality.
A) a user-based definition of quality.
Disaggregation: A) breaks the aggregate plan into greater detail. B) transforms the master production schedule into an aggregate plan. C) calculates the optimal price points for yield management. D) converts product schedules and labor assignments to a facility-wide plan. E) is an assumption required for the use of the transportation model in aggregate planning.
A) breaks the aggregate plan into greater detail.
The goal of inspection is to: A) detect a bad process immediately. B) add value to a product or service. C) correct deficiencies in products. D) correct system deficiencies. E) all of the above
A) detect a bad process immediately.
If a sample of items is taken and the mean of the sample is outside the control limits, the process is: A) likely out of control and the cause should be investigated. B) in control, but not capable of producing within the established control limits. C) within the established control limits with only natural causes of variation. D) monitored closely to see if the next sample mean will also fall outside the control limits. E) producing high quality products.
A) likely out of control and the cause should be investigated.
The "four Ms" of cause-and-effect diagrams are: A) material, machinery/equipment, manpower, and methods. B) material, methods, men, and mental attitude. C) named after four quality experts. D) material, management, manpower, and motivation. E) mentality, motivation, management, and manpower.
A) material, machinery/equipment, manpower, and methods.
The objective of aggregate planning is to meet forecast demand while ________ over the planning period. A) minimizing cost B) maximizing service level C) minimizing stock out D) minimizing fixed cost E) all of the above
A) minimizing cost
Under which of the following do planning tasks associated with job assignments, ordering, job scheduling, and dispatching typically fall? A) short-range plans B) intermediate-range plans C) long-range plans D) mission-related planning E) strategic planning
A) short-range plans
**CALCULATION** Your company has compiled the following data on the small set of products that comprise the specialty repair parts division. Perform ABC analysis on the data. (Table on Ch 12- Slide 15)
Annual Demand * Unit Cost = *Annual Dollar Volume* *Percent of Annual Dollar Volume* out of 100% *Class* = Rank high (A) to low (C-biggest group) ~ Dollar Volume: 625,000 6,750 1,200 22,500 7,500 Total: 100,450 %: .62 .07 .01 .22 .08 Class: A C C B B/C --> Closer to C
A manager wants to build 3-sigma x-bar control limits for a process. The target value for the mean of the process is 10 units, and the standard deviation of the process is 6. If samples of size 9 are to be taken, what will be the upper and lower control limits, respectively? A) -8 and 28 B) 16 and 4 C) 12 and 8 D) 4 and 16 E) 8 and 12
B) 16 and 4 --> UCL = x+z(sigma/[sqrt(n)]) --> 10+3(6/[sqrt{9)])=16 --> LCL = x-z(sigma/[sqrt(n)]) --> 10-3(6/[sqrt{9)])=4
An inventory decision rule states, "When the inventory level goes down to 14 gearboxes, 100 gearboxes will be ordered." Which of the following statements is TRUE? A) One hundred is the reorder point, and 14 is the order quantity. B) Fourteen is the reorder point, and 100 is the order quantity. C) The number 100 is a function of demand during lead time. D) Fourteen is the safety stock, and 100 is the reorder point. E) None of the above is true.
B) Fourteen is the reorder point, and 100 is the order quantity.
"Making it right the first time" is: A) a user-based definition of quality. B) a manufacturing-based definition of quality. C) a product-based definition of quality. D) the definition of quality proposed by the American Society for Quality
B) a manufacturing-based definition of quality.
Cycle counting: A) is a process by which inventory records are verified once a year. B) eliminates annual inventory adjustments. C) provides a measure of inventory turnover. D) assumes that all inventory records must be verified with the same frequency. E) assumes that the most frequently used items must be counted more frequently.
B) eliminates annual inventory adjustments.
One of Britain's largest children's hospitals working with a Ferrari racing team is an example of: A) internal benchmarking. B) external benchmarking. C) Taguchi concepts. D) employee empowerment. E) corporate responsibility.
B) external benchmarking.
Poka-yoke is the Japanese term for: A) card. B) foolproof. C) continuous improvement. D) fishbone diagram. E) just-in-time production.
B) foolproof.
Under which of the following do planning tasks associated with production planning and budgeting, as well as setting employment, inventory, and subcontracting levels, typically fall? A) short-range plans B) intermediate-range plans C) long-range plans D) demand options E) strategic planning
B) intermediate-range plans
To use revenue management strategies, a business should have which combination of costs? A) high variable and high fixed B) low variable and high fixed C) high variable and low fixed D) low variable and low fixed E) either A or B
B) low variable and high fixed
Which lot-sizing technique orders the quantity needed during a predetermined time between orders? A) economic order quantity B) periodic order quantity C) lot-for-lot D) time fencing E) part-period balancing
B) periodic order quantity
In the service sector, which of the following aggregate planning strategies might direct your client to a competitor? A) using part-time workers B) subcontracting C) changing inventory level D) varying production rates through overtime or idle time E) varying work force size by hiring or layoffs
B) subcontracting
An advantage of the fixed-period inventory system is that: A) safety stock will be lower than it would be under a fixed-quantity inventory system. B) there is no physical count of inventory items when an item is withdrawn. C) no inventory records are required. D) orders usually are for smaller order quantities. E) the average inventory level is reduced.
B) there is no physical count of inventory items when an item is withdrawn.
What is the typical time horizon for aggregate planning? A) less than a month B) up to 3 months C) 3 to 18 months D) over one year E) over 5 years
C) 3 to 18 months
Which of the following statements regarding control of service inventories is TRUE? A) Service inventory is a fictional concept, because services are intangible. B) Service inventory needs no safety stock, because there's no such thing as a service stock out. C) Effective control of all goods leaving the facility is one applicable technique. D) Service inventory has carrying costs but no setup costs. E) Good personnel selection, training, and discipline are easy.
C) Effective control of all goods leaving the facility is one applicable technique.
Which of the following is FALSE concerning enterprise resource planning (ERP)? A) It attempts to automate and integrate the majority of business processes. B) It shares common data and practices across the enterprise. C) It is inexpensive to implement. D) It provides and accesses information in a real-time environment. E) ERP software promises reduced transaction costs.
C) It is inexpensive to implement.
Which of the following statements is NOT true? A) Self-promotion is not a substitute for quality products. B) Inferior products harm a firm's profitability and a nation's balance of payments. C) Product liability transfers from the manufacturer to the retailer once the retailer accepts delivery of the product. D) Quality-be it good or bad-will show up in perceptions about a firm's new products, employment practices, and supplier relations. E) Legislation such as the Consumer Product Safety Act sets and enforces product standards by banning products that do not reach those standards.
C) Product liability transfers from the manufacturer to the retailer once the retailer accepts delivery of the product.
"The employee cannot produce products that on average exceed the quality of what the process is capable of producing" expresses a basic philosophy in the writings of: A) Armand Feigenbaum. B) Joseph M. Juran. C) W. Edwards Deming. D) Philip B. Crosby.
C) W. Edwards Deming.
Jars of pickles are sampled and weighed. Sample measures are plotted on control charts. The ideal weight should be precisely 11 oz. Which type of chart(s) would you recommend? A) p-chart B) c-chart C) both an x-bar chart and an R-chart D) an x-bar chart, but not an R-chart E) both a p-chart and a c-chart
C) both an x-bar chart and an R-chart
A firm uses graphical techniques in its aggregate planning efforts. Over the next twelve months (its intermediate period), it estimates the sum of demands to be 105,000 units. The firm has 250 production days per year. In January, which has 22 production days, demand is estimated to be 11,000 units. A graph of demand versus level production will show that: A) the January requirement is below level production of 420 units. B) level production is approximately 1000 units per day. C) level production of 420 units per day is below the January requirement. D) level production is approximately 420 units per month. E) the firm must hire workers between December and January.
C) level production of 420 units per day is below the January requirement. Yearly: 105,000/250=420 Jan: 11,000/22=500
Lot-for-Lot (Slide 14-30)
LOOK AT NOTES DIRECTLY FROM SLIDES IN BOLD
A firm practices a chase strategy. Production last quarter was 1000. Demand over the next four quarters is estimated to be 900, 700, 1000, and 1000. Hiring cost is $20 per unit, and layoff cost is $5 per unit. Over the next year, what will be the sum of hiring and layoff costs? A) $500 B) $2,500 C) $7,500 D) $7,000 E) $12,500
Q: 1, 2, 3, 4 Demand: 900, 700, 1000, 1000 Production (1000): _,_,_,_ Layoff ($5): _,_,_,_ Hiring ($20): _,_,_,_ ~ Work: Production: -Q1: 900 -Q2: 700 -Q3: 1000 -Q4: 1000 Layoff: -Q1: 100 -Q2: 200 --> 300x$5=*1500* Hiring: -Q3: 300 -->300x$20=*6000* *--->1500+6000=7500* ~ C) $7,500
Single-Period Example
Refer to 12-3-25+26
The annual demand for an item is 10,000 units. The cost to process an order is $75 and the annual inventory holding cost is 20% of item cost. What is the optimal order quantity, given the following price breaks for purchasing the item? What price should the firm pay per unit? What is the total annual cost at the optimal behavior?
Step 1 (is it feasible?) at $1.85: EOQ = sqrt(2DS/H) = sqrt([2*10,000*$75]/[.2*1.85])=sqrt(1,500,000/.37)=2013.47 --> not feasible (not 5,000+) at $2.30: EOQ=sqrt([2*10,000*75]/[2*2.30]) = $1,805.79 --> this is feasible (in 1,000-4,999) ~~~~ Option 1 -- Q=1806 Option 2 -- Q=5000 (starting price of lowest price) Therefore, the candidates are 1806 and 5000 ~~~~ Step 2 (Total Cost) Option 1: Q=1806 @ $2.30 TC=[(10,000/1806)(75)]+[(1806/2)(.2)(2.3)]+[10,000*2.30]=$23,830.66 Option 2: Q=5000 @1.85 TC=(D/2)S+(Q/2)IP+DP TC=[(10,000/5,000)*75]+[(5000/2)(.2)(1.85)]+[10,000*1.85] TC=$19,575 ~~~~ Questions/Answers: What is the optimal order quantity, given the following price breaks for purchasing the item? --> 5,000 (go for the LOWEST TC) What price should the firm pay per unit? --> $1.85 What is the total annual cost at the optimal behavior? --> $19,575 ~~~~ How many times should this company place an order per year? --> 2 times (D=10,000; Order $5,000)
Eagle Fabrication has the following aggregate demand requirements and other data for the upcoming four quarters. - Develop a plan that produce at a constant rate of 1200 and obtain the remainder from overtime. - What is the total cost? **Refer to table 13-31**
Table Columns: -*Quarter*: 1,2,3,4 -*Demand*: 1300,1400,1500,1300 -*Regular Time Production ($30)*:1200,1200,1200,1200 ---> 4800x30=14,400 -*Overtime Production ($40)*: -n/a-,100,300,100 --->500x40=20,000 -*Beginning Inventory*: 200, 100,0,0 -*Ending Inventory ($10)*: 100,0,0,-n/a- --->100x10=1,000 Sum of ---> 14,400+20,000+1,000=165,000
True or False? A major challenge in inventory management is to maintain a balance between inventory investment and customer service.
True
True or False? Averages of small samples, not individual measurements, are generally used in statistical process control.
True
True or False? Continuous improvement is based on the philosophy that any aspect of an operation can be improved.
True
True or False? Internal failure costs are associated with scrap, rework, and downtime.
True
True or False? Kaizen is similar to TQM in that both are focused on continuous improvement.
True
True or False? Mean charts and range charts complement one another, one detecting shifts in process average, the other detecting shifts in process dispersion.
True
True or False? Mistakes stemming from workers' inadequate training represent an assignable cause of variation.
True
True or False? Retail inventory that is unaccounted for between receipt and time of sale is known as shrinkage.
True
True or False? Some degree of variability is present in almost all processes.
True
True or False? The lot-for-lot lot-sizing technique is particularly appropriate when demand is not very smooth and set up cost is small compared to holding cost.
True
True or False? The quantity required of a dependent demand item is computed from the demand for the final products in which the item is used.
True
Graphics on Docs AND 4/6 CALCULATIONS WILL BE COVERED ON LAST CLASS
https://docs.google.com/document/d/1eBuGQz6MDizylTpJZqpQHNT18QeQR_aBchEYmLrOrL0/edit?usp=sharing
**CALCULATION** Cartons of Plaster of Paris are supposed to weigh exactly 32 oz. Inspectors want to develop process control charts. They take ten samples of six boxes each and weigh them. Based on the following data, compute the lower and upper control limits of 𝑥 ̅ and 𝑅 charts (INSERT TABLE FROM 6S-24)
n = 6 (NOT 10) x(double bar) = 34.23 sigma = UNKNOWN, so use 2nd UCL/LCL formulas x-charts: UCL = x(double bar)+A_2*R(bar) = 34.24+(0.483(FOUNDINGCHART))*(0.52) = 34.481 LCL = x(double bar)-A_2*R(bar) = 33.979 R-chart: UCL = D_4R = 2.004*0.52= 1.042 LCL= D_3R = 0 * .52 = 0 ON EXAM: is process in control? why/why not? --> Not in control, NOT WITHIN RANGE*
Chapter 12: Part 1
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Chapter 12: Part 2
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Chapter 12: Part 3
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Chapter 13
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Chapter 6 Managing Quality
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Chapter 6S: Statistical Process Control
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Chapter 14
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