OPERATIONS MANAGMENT IN...-ACCESS
7th Edition
ISBN: 9781259716225
Author: SCHROEDER
Publisher: MCG
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Question
Chapter 9, Problem 10P
a)
Summary Introduction
To determine: Whether the process is in control or not.
b)
Summary Introduction
To explain: How the supplier can more carefully control the process to provide 100 pounds of fish every day.
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Sam’s Long Life 60-watt light bulbs are designed to have a life of 1,350 hours with tolerance of ± 340 hours. A recent representative sample from the process that makes these light bulbs revealed a mean of 1,290 hours, with a standard deviation of 94 hours. Compute
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b. Explain to what extent the process for producing Sam’s Long Life 60-watt light bulbs would have to be improved to achieve 4-sigma quality.
c. show detail work
You work in the quality control department of a company that produces aluminum parts by pressure casting. Every day production conditions change twice. You need to take a witness sample from different production conditions and code these samples. If it is accepted that uninterrupted production is made throughout the year
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b)How would you code the first and last sample?
What is the significance of the order of observation in process control?
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- You are a Quality Manager for a very well-known food ingredient company that produces monosodium glutamate (MSG), and you are responsible for setting specification limits. The net weight (in grams) of bags of monosodium glutamate (MSG) is monitored by taking samples of eight bags on an hourly basis during production. The label on every bag reports a contents of 2 kg flour. The process mean is μ = 2018 g, and when the process is properly adjusted, it varies with σ = 16 g. QUESTION: Your organisation strives to ensure that >99.99% of bags of monosodium glutamate produced conforms to specification. What performance process index value is required to achieve this process yield?arrow_forwardYou are a Quality Manager for a very well-known food ingredient company that produces monosodium glutamate (MSG), and you are responsible for setting specification limits. The net weight (in grams) of bags of monosodium glutamate (MSG) is monitored by taking samples of eight bags on an hourly basis during production. The label on every bag reports a contents of 2 kg flour. The process mean is μ = 2018 g, and when the process is properly adjusted, it varies with σ = 16 g. QUESTION: Using all the available information, set the upper and lower specification limits.arrow_forwardYou are a Quality Manager for a very well-known food ingredient company that produces monosodium glutamate (MSG), and you are responsible for setting specification limits. The net weight (in grams) of bags of monosodium glutamate (MSG) is monitored by taking samples of eight bags on an hourly basis during production. The label on every bag reports a contents of 2 kg flour. The process mean is μ = 2018 g, and when the process is properly adjusted, it varies with σ = 16 g. QUESTION: Using what you know about QMP, would you advise your manager that the process is satisfactory when it is properly adjusted, or would you seek their approval to improve the process? Be sure to provide a full justification for your answer.arrow_forward
- One of the stages in the process of making denim cloth at the Southern Mills Company is to spin cotton yarn onto spindles for subsequent use in the weaving process. Occasionally the yarn breaks during the spinning process, and an operator ties it back together. Some number of breaks is considered normal; however, too many breaks may mean that the yarn is of poor quality. In order to monitor this process, the quality-control manager randomly selects a spinning machine each hour and checks the number of breaks during a 15-minute period. Following is a summary of the observations for the past 20 hours. Construct a c-chart using 3 limits for this process and indicate if the process was out of control at any time.arrow_forwardwhat types of error are attached in statistical process control? define and draw example. Sub: operation and supply chain managementarrow_forwardWhat is it important to prove that a process is proven capable before developing statistical control limit ?arrow_forward
- Explain what might cause a process to be out of control in managing quality ?arrow_forwardYou pull 5 bags of chips off of the production line every hour. The process is currently under control. The average weights are calculated for each sample, and the average of those averages is 129.1. The ranges are calculated for each sample, and the average of those ranges is 4.1. What is the Upper Control Limit for the X-bar chart? Round your answer to one decimal place.arrow_forwardThe Watson Electric Company produces incandescent light bulbs. The following data on the number of lumens for 40-watt light bulbs were collected when the process was in control. The standard deviation of the process is 15. Calculate control limits for an x-bar chart with 3-sigma limit and draw the chart. Since these data were collected, some new employees were hired. A new sample obtained the following readings: 625, 592, 612, and 650. Is the process still in control?arrow_forward
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