Operations Management
13th Edition
ISBN: 9781259667473
Author: William J Stevenson
Publisher: McGraw-Hill Education
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Chapter 10, Problem 4CTE
Summary Introduction
To determine: The situations where quality control charts are needed.
Introduction: Quality is a measure of excellence or a state of being free from deficiencies, defects and important variations. It is obtained by consistent and strict commitment to certain standards to attain uniformity of a product to satisfy consumers’ requirement.
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Describe a control chart and illustrate with an example. What are the differences between a control cart and a run chart.
From the list below of the data being collected, identify which data would be appropriate for X-bar and R control charts:
Select ALL correct answers.
Fluid ounces in a bottle of detergent
Temperature of the fryer oil at the Lay's potato chip plant
Number of mistakes per article in a newspaper
Percentage of flights that were not on-time for an airline
Pizzas not made to order for a local pizzeria
Weight of a bag of chips.
Density of a golf ball
Percentage of patients that had a medication error during their hospital stay
SECOND PART
From the list below of the data being collected, identify which data would be appropriate for a P chart:
Select ALL correct answers.
Fluid ounces in a bottle of detergent
Temperature of the fryer oil at the Lay's potato chip plant
Number of articles with mistakes per every 100 sampled at a newspaper
Percentage of flights that were not on-time for an airline
Pizzas not made to order for a local pizzeria…
Control charts for X-bar and R, using a subgroup size of 5, are to be applied to control thecritical dimension of a certain manufacturing process. Specifications call for a nominal dimension of1,250.000 + 0.050 mm. The process is believed to have a σ of 0.015 mm Determine appropriate control limits for the X-bar and R charts.
a) After 12 subgroups have been drawn and X-bar and R plotted on the charts, a computation of X-double bar give 1,250.015. b1) What is the probability that a value of X-bar will fall within the limits if this is the true value of the mean setting? b2) What is the probability that all 12values fall within the control limits?
b) Make the necessary calculations to determine if the process can meet specifications by solvingfor Cp, Cpu, CpL, Cpk . Assume a normal distribution of product output. Illustrate how the processwould look like relative to the result of the computations of the process capability analysis.
Chapter 10 Solutions
Operations Management
Ch. 10.2 - A potato chip is a delicate thing Fragile A pound...Ch. 10.2 - A potato chip is a delicate thing Fragile A pound...Ch. 10.5 - It's estimated that more than 7 000 hospital...Ch. 10.5 - It's estimated that more than 7 000 hospital...Ch. 10 - Prob. 1DRQCh. 10 - Prob. 2DRQCh. 10 - Prob. 3DRQCh. 10 - Prob. 4DRQCh. 10 - Prob. 5DRQCh. 10 - Prob. 6DRQ
Ch. 10 - Prob. 7DRQCh. 10 - Prob. 8DRQCh. 10 - Prob. 9DRQCh. 10 - Prob. 10DRQCh. 10 - Prob. 11DRQCh. 10 - Prob. 12DRQCh. 10 - Prob. 13DRQCh. 10 - Prob. 14DRQCh. 10 - Prob. 15DRQCh. 10 - Prob. 16DRQCh. 10 - Prob. 1TSCh. 10 - Prob. 2TSCh. 10 - Prob. 3TSCh. 10 - Prob. 1CTECh. 10 - Prob. 2CTECh. 10 - Prob. 3CTECh. 10 - Prob. 4CTECh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 11PCh. 10 - Prob. 12PCh. 10 - Prob. 13PCh. 10 - Prob. 14PCh. 10 - Prob. 15PCh. 10 - Prob. 16PCh. 10 - Prob. 17PCh. 10 - A production process consists of a three-step...Ch. 10 - Prob. 19PCh. 10 - Prob. 20PCh. 10 - Prob. 21PCh. 10 - Prob. 22PCh. 10 - Prob. 23PCh. 10 - Prob. 24PCh. 10 - Prob. 25PCh. 10 - Prob. 26PCh. 10 - Prob. 27PCh. 10 - Prob. 28PCh. 10 - Prob. 29PCh. 10 - Prob. 1.1CQCh. 10 - Prob. 2.1CQCh. 10 - Prob. 2.2CQCh. 10 - Prob. 2.3CQCh. 10 - Prob. 2.4CQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- we have seen various methods to set control limits for control charts. Which method would you prefer and why?arrow_forwardWhich of the following is not considered to be one of the seven basic quality tools 1)control charts 2)check sheet 3)histogram 4)ABC analysis 5)cause - and - effect diagramarrow_forwardDo control charts assist in monitoring quality as conformance or quality as improvement?arrow_forward
- Why is calibration important to a good quality control system?arrow_forwardScott Paper tests its toilet paper by subjecting 6 rolls to a wet stress test to see whether and how often the paper tears during the test. Following are the number of defectives found over the last 6 days: 2, 3, 1, 2, 2, and 3. Lower and upper control limits are, respectively: O a. 6.58 and 0 O b. O and 6.58 None of them O d. O and 6.24 O e. O and 6.90arrow_forwardControl charts are to be established on the manufacture of backpack frames. The revised fraction nonconforming is 0.08. Determine control limit lines for inspection rates of 1100 per day, 1500 per day, and 2100 per day. Draw the control chart. Why are the control limits not spaced equally? ( don't hand writing solution)arrow_forward
- Create the appropriate control chart(s) required to monitor this processarrow_forwardThe following data were collected on the number of nonconformities per unit for 10 time periods. Complete parts (a) and (b). Time 1 2 3 4 5 6 7 8 9 10 Nonconformities Per Unit 23 11 14 15 6 14 11 9 13 6 a. Construct the appropriate control chart and determine the LCL and UCL. What is the lower control limit? Select the correct choice below and fill in any answer boxes within your choice. A. LCL=enter your response here (Round to three decimal places as needed.) B. There is no lower control limit.arrow_forwardAnswer these questions about inspection:a. What level of inspection is optimal?arrow_forward
- The Healthy Chocolate Company makes a variety of chocolate candles, including a 12-ounce chocolate bar (340 grams) and a box of six 1-ounce chocolate bars (170 grams). a.Specifications for the 12-ounce bar are 322 grams to 358 grams. What is the largest standard deviation (In grams) that the machine that fills the bar molds can have and still be considered capable if the average fill is 340 grams? (Round your intermediate calculations to 2 decimal places and final answer to 3 decimal places.) Standard deviation b.The machine that filles the bar molds for the 6-ounce bars has a standard deviation of .84 grams. The filling machine is set to deliver an average of 1.04 ounces per bar. Specifications for the six-bar box are 150 to 190 grams per box. Is the process capable? Hint: The variance for the box is equal to six times the bar variance. Convert all calculations Into grams. O Yes O No grams c.What is the lowest setting in ounces for the filling machine that will provide capability in…arrow_forwardWhy is order of observation important in process control?arrow_forwardWaiting time (minute) at a Tim Horton is monitored using sample mean and range control charts. Six samples of n = 10 observations have been obtained and the sample means and ranges computed (in minutes): Determine the upper and lower limits for sample mean and range control charts. Is the process in control? Draw appropriate control chart (s).arrow_forward
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