OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
7th Edition
ISBN: 9780077835439
Author: Roger G Schroeder, M. Johnny Rungtusanatham, Susan Meyer Goldstein
Publisher: McGraw-Hill Education
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Concept explainers
Question
Chapter 9, Problem 5P
a)
Summary Introduction
To explain: How to use p chart to explain if there is a difference between the two shifts.
b)
Summary Introduction
To determine: The center line and the UCL and LCL for the first shift.
c)
Summary Introduction
To explain: If the process means have moved downwards or upwards.
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Students have asked these similar questions
Widgets are made in a two-shift operation. Management is wondering if there is any difference in the proportion of defectives produced by these two shifts. a. How would you use the p control chart to determine if there is a difference between the two shifts? Explain. b. On the first shift, samples of 200 units have been used and p = .06. Calculate CL, UCL, LCL for the first shift. c. On the second shift, six samples of 200 units have been taken with the proportion of defectives .04, .06,.10, .02, .05, and .03. Using the samples from the second shift, has the process mean shifted upward or downward? Explain.
Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed:
Sample
Mean
Range
1
3.06
.42
2
3.15
.50
3
3.11
.41
4
3.13
.46
5
3.06
.46
6
3.09
.45
Using the factors in Table 10.3 , determine upper and lower limits for mean and range charts.
Is the process in control?
A green belt is going to monitor the process by collecting more than 10 samples per group. Which of the following control charts would be most appropriate ?
a. I-MR
b. Xbar R
c. X bar S
d. np chart
(Don't Hand writing in solution) .
Chapter 9 Solutions
OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
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- The Digital Guardian Company issues policies that protect clients from downtime costs due to computer system failures. It is very important to process the policies quickly because long cycle times not only put the client at risk, they could also lose business for Digital Guardian. Management is concerned that customer service is degrading because of long cycle times, measured in days. The table contains the data from five samples, each sample consisting of eight random observations. 9 Click the icon to view the table with sample data. Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. a. What is your estimate of the process average? The estimate of the process average is (Enter your response rounded to two decimal places.)arrow_forwardYou are improving a metric called Cycle Time. This is the time taken for raw materials that go through the different internal processes and convert into finished goods. You capture one data point each day. Which control chart will you use to monitor this metric.This question is required. A NP Chart B C Chart C I-MR Chart D X-Bar R Chartarrow_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
- Which tool is very useful in documenting and presenting the whole process Select one a control chart b. check sheet O c flow chart O d. Pareto chart e histogramarrow_forwardThe Digital Guardian Company issues policies that protect clients from downtime costs due to computer system failures. It is very important to process the policies quickly because long cycle times not only put the client at risk, they could also lose business for Digital Guardian. Management is concerned that customer service is degrading because of long cycle times, measured in days. The table contains the data from five samples, each sample consisting of eight random observations. E Click the icon to view the table with sample data. Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. a. What is your estimate of the process average? The estimate of the process average is 10.43. (Enter your response rounded to two decimal places.) b. What is your estimate of the average range? The estimate of the average range is . (Enter your response rounded to two decimal places.)arrow_forwardPDSA cycle is also known as: a. Ishikawa tool b. Control chart c. Histogram d. Deming cycle e. Parteto analysisarrow_forward
- (1) Sample size is the number of samples you collected in quality management. A v A True B False (2) If an individual observation is above the UCL or below the LCL for the mean chart, the mean chart is out of control. A A True B False (3) A process is in control if BOTH the mean chart and the p chart are in control. A True B False (4) In "Slack Time Remaining (STR)" approach, the slack time remaining = Processing Time - Due Date. B v A True B. Falsearrow_forwardestion A control chart used to monitor the process mean is known as O a. R-chart et ered O b. p-chart ed out of O c. C-chart O d. Grant chart lag stion O e. x-bar-chait PREVIOUS PAGEarrow_forwardShift in the process mean for a measured variable would be best detected by a O a. p chart P b. chart Of. a chart O d. x barchart O e. R Chartarrow_forward
- A shift in the process mean for a measured variable would be best detected by a O a. p-chart O b. R-chart O c. x-bar-chart O d. c-chart O e. s-chartarrow_forwardDesign a process control system using control charts.arrow_forwardA process that is assumed to be in control with limits of 91 ± 2 had sample averages for the X-bar chart of the following: 87.1.87, 87.2,89,90, 88.5, 89.5, and 88. Which of the following statement below are correct? a. None is correct Ob. Process mean is in-control O C. Process mean is not in-control O d. Not enough information to determine NEXT PAGE PAGEarrow_forward
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