Operations Management
13th Edition
ISBN: 9781259667473
Author: William J Stevenson
Publisher: McGraw-Hill Education
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Chapter 10, Problem 11P
Summary Introduction
To estimate: The percentage of process output that can be expected to fall within the specifications and determine whether the specifications are being met.
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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This exercise contains only parts a and b.
a) For the given data, the
x= ____ hours (round your response to three decimal places).
For the given data, mean range =_____hours (round your response to two decimal places).
With
z=3,
the control limits for the mean chart are:
UCLx= ____hours (round your response to three decimal places).
LCLx=____hours (round your response to three decimal places).
The control limits for the range chart are:
UCLR=____hours (round your response to two decimal places).
LCLR=h____ours (round your response to two decimal places).
With these limits established, West now takes 5 more hours of data, which are shown in the following table. Calculate the mean and range for each hour that the sample data is taken. (Enter your responses for the mean to…
A hospital is using X bar and R charts to record the time it takes to process patient account information. A sample of five applications is taken each day. The first four week's (20 days) data give the following values:
X=16 min
R= 7 min
The upper and lower specifications are 21 minutes and 13 minutes respectively. What is the CPK of this process?
A maintenance group wants to increase the effectiveness of the repair work by tracking the number of maintenance requests that require a second call to complete the repair. The table below shows the data for 20 weeks. Is this process under control in terms of the rate of maintenance requests requiring a second call? Indicate whether the process is under control by drawing appropriate control charts / graphs.
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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- The mean service time (x¯) of a hairdresser is 18 minutes with a standard deviation (σ) of 2 minutes. Upper specification limit (USL) is 22 minutes, whereas lower specification limit (LSL) is 15 minutes for this process. What is the process capability index (cpk) for this process? Is the process capable? Cpk=0.67, capable Cpk=1.5, capable Cpk=0.67, not capable Cpk=0.5, capable Cpk=0.5, not capablearrow_forwardThere is a 4 percent error at a specific point in a production process. If an inspector is placed at this point, all the defects can be detected and eliminated. The inspector would cost $8 per hour and could inspect unit in the process at the current production rate of 45 per hour. If no inspector is hired and defects are allowed to pass a point, there is a cost of $9 per defective unit to correct the defects later. If an inspector is hired, what will be the inspection cost per unit? (Round to 3 decimal places.) If an inspector is hired, what will be the defective cost per unit? (Round to 3 decimal places.) Should an inspector be hired based on cost alone?arrow_forwardA new industrial oven has just been installed at the Piatt Bakery. To develop experience regarding the oven temperature, an inspector reads the temperature at four different places inside the oven each half hour. 8:00 am 350 350 355330 9:00 am 344 342 338340 10:00 am 341 345 347 350 Lower and upper limits, respectively, for S-chart are: O a. O and 13.18 O b. O and 10.68 O c. 13.18 and 0 O d. O and 10.10 O e. None of themarrow_forward
- If a process has 0.00475 defects per opportunity, what is the dpmo?arrow_forwardPressurized steam at 4 4 0 K flows through a long, thin-walled pipe of 0.64 m diameter. The pipe is enclosed in a concrete casing that is of square cross section and 1.45m on a side. The axis of the pipe is centered in the casing, and the outer surfaces of the casing are maintained at 340 K . What is the rate of heat loss per unit length of pipe?arrow_forwardExercise: In a given MISO-type automation system in a chemical industry, where the fluid flow is controlled based on input data, the control system manager performs analysis of operation of the mesh and finds that the time to achieve the expected result is currently 25% longer than the time required for the same situation when the process was implemented 5 years ago. Given the characteristics of the process under analysis, determine the improvement action to be taken by the manager so that the time deviation is minimized, justifying its response with subsidies that substantiate your claims. Consider that the process flow had no changes in the period and that the control actions remain the same.arrow_forward
- Background information: Allison collected additional days of data to monitor the process. Steps to monitor using the control charts: Now monitor the process. An additional ten days of data have been collected, see table labeled “1st 10 Days of Monitoring Reservation Processing Time” in the Data File. Develop Xbar and R charts for the 1st 10 days of monitoring. Plot the data for the 1st 10 days on the Xbar and R charts. Is the process in control? If the control chart indicates an out-of-control process, note which days, the pattern, and whether it is the Xbar or R chart. Now that we have set up the control charts using enough data from a stable process, the 30 days of data, we will monitor the process. While monitoring the process, what will we use as the lower control limit for the X-bar Chart to compare against our new x-bar values ? Enter your response to three decimal places. You do not need to include the units (minutes), ONLY the numeric value. USE EXCELL DATA TO GET…arrow_forwardA spring water factory ensures that each water bottle contains precisely 16.9 fluid ounces with an acceptable margin of error of 0.1 fluid ounces. If the standard deviation of the water bottles is 0.06 fluid ounces, what is the process capability ratio (Cp) of the water bottles? 0.56 01 1.2 1.67arrow_forwardThere is a 3 percent error rate at a specific point in the production process. If an inspector is placed at this point, all the errors can be detected and eliminated. However, the inspector is paid $8 per hour and can inspect units in the process at the rate of 30 per hour. If no inspector is used and defects are allowed to pass this point, there is a cost of $10 per unit to correct the defect later on. Should an inspector be hired?arrow_forward
- At Quick Car Wash, the wash process is advertised to take less than 7 minutes. Consequently, management has set a target average of 390 seconds for the wash process. Suppose the average range for a sample of 10 cars is 11 seconds. Part 2 The UCL Subscript Upper R equals seconds and the LCL Subscript Upper R equals seconds. (Enter your responses rounded to two decimal places.)arrow_forwardFor the given information, the process capability index (Cpk) = ? (enter your response here) (round your response to two decimal places).arrow_forwardWhy do you need to develop the mathematical model of a process you want to control?arrow_forward
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