Enterprise Resource Planning (ERP): The Dynamics Of Operations Management 1st Edition Avraham Shtub - Solutions

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The output of one process is normally distributed with the mean of 4 and standard deviation of 0.4, and the lower specific limit is 3.28.Which out of the following sampling plans would you suggest the company to adopt in order to have an AOQ of 2.5%?(60, 2); (80, 3); (90, 4); (140, 5); (200, 7)
A food supplier is providing Tesco with 1,000 cartons of milk every day and suggests three sampling plans for its customer as follows:☑ (10, 2)☑(20, 3)(30,4)If you are the quality controller of Tesco, which one do you think has the best AOQL?
An automotive component company (BBCC) is asked by a very important customer to redefine sampling procedures. The customer's quality manager says "in the past there were occasions in which we had to accept lots with a 4% of defects, and that is unbearable due to our stringent quality requirements;
In company BETA, bottles of liquid soap are filled by means of an automatic filling machine. The machine has been set up so that the average content of any bottle be equal to 0.92 kg of soap (with a standard deviation of 0.04 kg).The producer guarantees a minimum of 0.9 kg; bottles with less than
ACME is using a sampling plan with the following probabilities of acceptance:☑98% in case of a lot with 2% defect rate 90% in case of a lot with 4% defect rate 70% in case of a lot with 6% defect rate 50% in case of a lot with a 8% defect rate 25% in case of a lot with a 10% defect rate 10% in
Find out a single sampling plan which guarantees a = 0.08 and ẞ = 0.008, with AQL == 0.012 and with LTFD = 0.05.
At company FoodShipping, packs of biscuits produced by FoodPacking are shipped to customers in lots of 500 packs each. Regarding the net weight contained in the packs, the process is in state of control, with a mean of 310 g and a standard deviation of 5 g. The company has a commitment of a minimum
The supply manager of ACME Company wants to set up a sampling plan abiding by the following conditions:☑ AQL = 4%☑ Supplier risk = 6%☑ AOQL = 5%Help him finding out the most economical plan.
Use of the Military standard tables:Determine the sampling plans for the following situations:Very critical component, N = 4000, AQL = 0.4%Critical component, N = 800, AQL = 2.5%
Build the OC curve for a sampling plan in which n = 10 and c = 1
Define a sampling plan so that a = 0.01, AQL = 0.01, ẞ = 0.1, LTFD = 0.06
Youthmilk buys the packaging material from a big local supplier. In order to control the quality of the plastic film used to wrap cheese, the purchasing department is using the following single sampling plan (2000, 20, 1).Which is the probability to accept a lot containing 40 nonconforming units?
A process produces a defective unit out of every 500. Given a sample of 100 units determine the probability of:
If N = 1000, n = 10 and c = 1 What is the probability to accept a lot containing 1 defective unit?
A production process produces 200,000 pieces per shift (of 8 hours). On a certain CtQ characteristic (axis length), the process is in state of control, with a mean of 310mm and a standard deviation of 0.4 mm. The quality check is very expensive, requiring component destruction. The management of
At FoodPacking Co, the packaging process produces 10,000 units of canned peas packs per day. Regarding the net weight contained in the packs, the process is in state of control, with a mean of 310 g and a standard deviation of 5 g. The company has a commitment of a minimum mean of 300 g, calculated
The output of a process is normally distributed with a mean of 100 ml and a standard deviation of 1 ml.Establish the limits for a set of x -S control charts, allowing identifying a shift of+0.7 ml in less than 3 hours with a probability of 99%. There is more than one solution; please comment upon
After sampling a process, the Quality Manager found out that the cutting process for a certain item has an average (X) of 100 cm² and a standard deviation (S) of 1 cm².Design a control chart system x and S abiding by the following conditions:☑Symmetrical control limits;False alarm probability =
The output of a process is normally distributed with a mean of 100 and a standard deviation of 1.Build, following the Shewhart's model, a complete control chart system (both mean and dispersion must be controlled), with which you could identify a shift of+0.4 in 45 minutes on average. Comment in
The quality manager of a wood and furniture company extracts 20 samples from a process, each sample containing 4 units. The measures of the thickness of the panels returns an average sample mean equal to 431 mm and the sample standard deviation of 45 mm. Determine a no standard given X-S control
A company produces small roller bearings whose internal diameter is a critical feature. They are required to have an average diameter of 3mm with a standard deviation of 0.2mm. The rectifying machine works on two shifts. Cycle time is 2 minutes.SO✓☑In order to verify this diameter a Control
Tiff & Tough is producing metal parts in big batches. A production run lasts several days and yields 1,000 pieces per hour of production. The Quality Control Department inspects random samples every half-an-hour. Inspection results are shown in the following table, where for every sample it
INTA is a private label company manufacturing packaged food. The baked products department (BPD) produces 10.000 packs of biscotti a day. Its quality control department checks a sample of 5 packs every one hour. The quality controller used data in table 1 to develop an X- R Control Chart system.
A company produces small motor shafts whose edges smoothness is a critical feature. They are required to have an average curving radius of 0.1 mm with a standard deviation of 0.012 mm. The machine which produces the curving radius operates on three daily shifts and each cycle lasts 10 minutes.In
Company Gamma produces steel valves on a machining centre. The centre operates small batches of 50 pieces each (total cycle time for a lot is about 15 minutes).The quality manager knows that, after machining, valves have a small hole with a diameter of 1 mm on average (and with a standard deviation
You run a well consolidated process, of which you know the true mean and the true standard deviation (μ = 40db; σ = 1db). You have to set up a control chart system abiding by the following conditions:☑ Total false alarm probability = 5%;☑ Sampling frequency = 1 sample every 30 minutes;Average
A polishing process produces 12,000 pieces per hour in very small lots. On a certain Critical to Quality characteristic, the process is in state of control, with a mean of 100µm and a standard deviation of 5µm. The quality check is very expensive, requiring component destruction.The management of
The a quality responsible of a production process is interested in setting up control charts system for the length of products. She inspects 15 pieces and gets the following results (measures are in mm):By using the data in the above table, define a control chart system abiding by the following
You are running a production process whose output is normally distributed with mean 50 mm and standard deviation 1mm. Please set up a control chart system according to the following specifications:✓☑Symmetrical control limits;Average time to signal a shift in the mean of + 0.5mm = 4 hours;Total
Company ALPHA is using a Control Chart for the average with the following limits:σ σ UCL=μ+3; UCL=+3-.30√n n where μ = 100 °C; o = 1 °C; n = 9.If the company is taking a sample every 1 hour, what will be the average time to detect a shift of 1 °C?
Phil & Tee is a screw maker. The quality gate controls 10% of the production to check the planarity of screws. The ALU-line is historically showing a 1.2% defectiveness rate.Define a control chart with total false alarm with the process under control equal to 2%.
To control the painting process a painted panel is controlled every 30 minutes. Historically, the average number of micro-defects that can be found on a painted wooden panel classified as A is 32. Define a coherent Control Chart system if the expected number of out of control must be 1 out of 100.
Best Soda Ever is a bottling company. The average content of a bottle is 50 cc and the standard deviation is 0.2 cc. The production manager is still quite doubtful on what couple of control charts to use. Calculate control chart for mean, range and standard deviation if n = 5.
In a company manufacturing industrial heating systems, the quality manager tries to figure out the tolerance of the production process of a certain piping. 25 different samples (of sample size = 4) are taken from the production process.Knowing that the specification limits are [124,400÷124,600],
Ernesto Bracciforti produces electric engines. During the first five days of production, quality manager tests the speed of rotation of 4 engines every day.
Scrolls Ltd produces track-balls for entertainment and gaming devices. The specification limits for the internal diameter for the item named AK27 are:USL = 35 mm LSL = 32 mm In the production process of AK27, the quality controller measured 10 components and recorded the data as follows:
TMC is a small tube manufacturer famous for its high customization levels. Its customers can tailor specifications for a certain number of relevant dimensions of the tubes.For a certain customer the hole diameter (Critical to Quality characteristic) has the following specification limits: target
SuperMotor Ltd produces exhausts for motorbike applications.The production process for the exhausts piping is as follows:Phase n.1: piping production - the length of the piping is normally distributed with mean 0.8 meters and standard deviation 1 cm Phase n.2: cut away a segment of pipe in order to
HouseWives Co produces customized brooms: for maximum comfort of the customer, there are 6 measures of brooms (ranging from "Tiny" to "Extra-Large"). The production process for brooms is as follows:☑☑Phase n.1: produce a pole of standard length - the output of the process is normally
The width ofa plastic component is normally distributed with a standard deviation of 2.15 mm. The minimum acceptable width is 49 mm. The quality engineer analyses the following sample:a) If the average width was equal to the sample mean, what would the percentage of defective components be?b) Build
In the context of a 60 approach, the CEO of Arancia di Sicilia (a company which produces and sells 33.3 cl bottles of orange juice) realizes that the target of having less than 0.01% defects has not been reached. The production manager claims that the unsatisfactory performance is due to process
In order to match the edges of the cockpit it must be assembled with, a moulded plastic part should be produced according to the following specifications:USL = 17 mm LSL = 15 mm The pressing process is run with the following parameters:µ = 16.1 mm σ = 0.2 mm Calculate the Sigma Level (short and
RWIB Ltd is a company producing paper clips and selling them in boxes containing 300 pieces each. The production manager says that the filling machine puts 299.7 (on average) clips in each box - with a variance of 0.04. Boxes that contain less than 299 or more than 301 clips are considered
The thickness of a PVC film is described by a normal distribution (μ = 200 µm; variance = 400 µm²).
A production process realizes shafts whose diameter is normally distributed withµ = 34.08mm o = 0.05mm.If the tolerances are 34.00 ± 0.15 mm, what is the probability of producing a shaft falling out of the tolerances?
In a water circulation system, the temperature of water is kept close to a target level with a mean of 50 °C, and a range of ±5.4 °C, defined as the natural tolerance window. The temperature distribution can be described by a Normal Distribution.a) What is the probability of temperature being
In the Satellite Airport, the average luggage delivery time (time between airplane landing and the moment in which the first piece of luggage is conveyed out in the reclaiming area) is 28 minutes, with a standard deviation of 4 minutes; while the average time passengers take to arrive to the
In the class of 25 students, what is the probability that two or more of them were born on the same day?
By entering the warehouse an employee knocks over a pallet on which N = 8 packages halogen lamps were positioned. Each package contains 2 lamps.Due to the bump, D = 4 lamps suffer damage. Calculate the expected number of non-damaged packages (A package is not damaged if BOTH the lamps contained in
A company produces eyewear (spectacles, sunglasses) for fashion brands. Lenses are manufactured in the plant and then assembled on the frame. You know, from historical data, that 1 lens out of 2,000 is scratched and 1 lens out of 5,000 is dented.At the end of the final assembly process, what's the
Build an histogram and a Box Plot for the following sample, describing the weekly yield of one semiconductors manufacturing plant.
The following data set represents the results of a stress test for a stainless steel gasket.Please represent the data using an appropriate graph:
The quality manager of NewPlast records some data in order to monitor the variability of the output of adhesive mixture. In the following table there are the values of adhesive strength of 80 batches of glue. Each batch is represented with a label which has two letters and one number:the first
Please comment on the diagram below: 18 16 14 12 10 8 E 42 Exercise 7 Histogram 230 235 240 245 250 255 260 265 What is the sample size? In how many classes was the data set split? Is that a correct choice? Which information could you gain by looking at the figure?
The following data contain the results of the resistance test on a sample of steel bars.Represent them through an appropriate graph. Which conclusions could you draw by analyzing the graph?
Chapter 1, draw the BoxPlot.
From the values at
OEE (Overall Equipment Effectiveness) is one of the most important performance index used to monitor and improve the usage of equipment. OEE usually deployed at different levels, showing the impact of losses in the production. Values are referred to a one month of production: 20 days, 3 shift per
The following table provides data regarding the diameters of fifteen drilled holes.Represent the data set through an Histogram and a boxplot.Exercise ЗDownloading the list of Constructor Championship winner from the official Moto GP site, build an updated Pareto chart.
. in Chapter 1, draw an Histogram of the data.
Using data from
Little Maid is a yeast producer. 90% of the production volumes are absorbed by the 50 grams diced yeast. Thanks to the historical data, production manager knows the production is following a Normal distribution N(25, 0.0225). The production is controlled every 10 minutes and the average net weight
You use to have Kellogg's cereals for breakfast. You know that a full box contains on average 450 g of cereals with a standard deviation = 15 g. Every morning, you consume an amount of cereals which is normally distributed with mean 50 g and standard deviation 10 g.What is the distribution of the
The following is the distribution of frequency of the weight of packaged butter(the target weight is 0.25 kg). Find out mean, median and standard deviation of the sample.
A factory produces steel bars; the quality engineer analyses a sample of 14 bars and measures their lengths: Bar Length [mm] Bar Length [mm] 1 364.8 8 366.3 234567 365.1 9 366.3 365.2 10 366.5 365.8 11 366.5 366.0 12 366.6 366.2 13 366.9 366.2 14 365.9
Calculate mean and standard deviation of the following samples: Sample a b C 1 34 38 68 2 36 40 72 3 33 37 66 4 32 36 64 5 28 32 56 6 31 35 62 7 30 34 60 8 24 28 48 9 25 29 50 10 32 36 64 11 30 34 60 12 28 32 56
Consider the data below, describing the weight (in grams) of 5 different batches of chocolate cookies produced by Cookie & Co during one production shift. Find out the average range of the samples.
Calculate the standard deviation of the following samples:a) 2, 4, 5, 6, 7, 9b) 102, 104, 105, 106, 107, 109c) 1.02, 1.04, 1.05, 1.06, 1.07, 1.09
What is the modal value for each sample?a) 3,5, 4, 7, 5b) 2, 4,3, 5, 4, 2, 7, 2c) 10, 11, 13, 11, 12, 13, 11,13
What is the median for each sample?a) 144, 146, 146, 154b) 3, 5, 4, 7, 5c) 2, 5, 7, 4, 5, 3
Study the quality programme of one of the gurus featured in this text. Decide which activities you think fit into the three phases of Planning, Implementation and Control. What additional steps would you add to these programmes to enhance them?
What difficulties might you encounter in using Critical Systems Heuristics in a corporate situation?
Compare the two methodologies outlined in this chapter. Under what circumstances would you use each?
What problems might you encounter in establishing a hierarchy of Quality Councils? How would you structure them to ensure that interactions between units were adequately catered for?
Consider the way in which tasks are undertaken in a fast food restaurant near you. How could the tasks be redesigned to increase job satisfaction? What do you think would be the effect on the organisation?
Consider the food industry example just provided. Suggest ways in which a more equitable balance of power could be achieve?
What measures ofperformance would you use tolect benchmarking partners?
Using the process map developed at chapter 20, identify critical points where statistical data gathering would generate useful results.Select appropriate techniques for recording the values, justify your choices.
Identify the strengths and weaknesses of an IS0 9000 standard quality management system. Consider how this system may be used to improve quality performance?
What barriers would you expect to meet in designing and implementing a Business Process Re-engineering program?
What difficulties might be encountered in attempting to adopt a‘TSI’ based approach to quality manageme?
How do you use ‘soft’ approaches to problem solving in your day-today life?
Attempt to describe your class or tutorial sessions in terms of cybernetic processes.
What do you think might be the ‘emergent’ properties of a University? Why?
Evaluate the contribution of contingency theory to the pursuit of quality.
Taguchi believes that quality is a societal, rather than an organisational issue. Discuss.
Shingo's approach to measuring quality through technical, auto- mated systems is criticised for being open to abuse by autocratic managements. Consider how this problem might be overcome while preserving the value of Shingo's ideas.
Oakland proposes that ‘Quality is the only issue for organisational survival.’ Discuss this proposal in the light of the challenges facing contemporary organisations.
Juran defines quality as ‘fitness for use or purpose’. Critically evaluate this definition.
Quality circles are Ishikawa's principal method for achieving participation. Critically evaluate quality circles in your own cultural context.
The chapter suggests difficulties might arise firom Feigenbaum’s definition of a ‘Total Quality System’ with its ‘Weberian, bureaucratic overtones’. Defend Feigenbaum’s work against this suggestion.
Deming suggests that 94 per cent of quality problems are the responsibility of management. Review this statement?
Discuss Crosby’s assertion that ‘There is no such thing as a quality problem.
Compare and contrast the machine view of organisations with the organic view. Suggest other metaphors which might be appropriate for these styles of management?
Identify the barriers to quality in your own organisation (or one which is well known to you). Justify your choices and outline ways inwhich they might be overcome?
Develop the ten most important steps in implementing ERP in an organization.
Use the problem solving methodology discussed in Chapter 8 to solve the problem of finding the best way to teach operations in a business school setting. Explain each step in the process and the results of your analysis.
What are the relationships between input output analysis and CRP?
Explain how should the red level policy be set in the purchasing area.
What kind of monitoring and control system is used in a supermarket to support the decision on the number of open checkouts?

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Enterprise Resource Planning (ERP): The Dynamics Of Operations Management 1st Edition Avraham Shtub - Solutions

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