OPERATIONS MANAGEMENT (LL)-W/ACCESS
17th Edition
ISBN: 9781260037821
Author: CACHON
Publisher: MCG
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Chapter 9, Problem 8CQ
Summary Introduction
To determine: The correct option for the given information.
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A process generating attribute data has an estimated sigma capability = 3.3. Assuming the process mean is shifted +/- 1.5 sigma from the target value, what is the estimated dpmo? Estimated dpmo = ____.
When plotting a process, with the intention of monitoring trends, which of the following apply?
Select one:
a.
An increase in the mean and a decrease in variation is desirable
b.
A decrease in both the mean and variation is desirable
c.
The optimum mean may be lower or higher than current values
d.
The mean is not as important as the variation
At Webster Chemical Company, lumps in the caulking compound could cause difficulties in dispensing a smooth bead from the tube. Even when the process is in control, an average of four lumps per tube of caulk will remain. Testing for the presence of lumps destroys the product, so an analyst takes random samples. The following results are obtained:
Tube No.
Lumps
Tube No.
Lumps
Tube No.
Lumps
1
6
5
6
9
5
2
5
6
4
10
0
3
0
7
1
11
9
4
4
8
6
12
2
Determine the c-chart two-sigma upper and lower control limits for this process. Is the process in statistical control?
Chapter 9 Solutions
OPERATIONS MANAGEMENT (LL)-W/ACCESS
Ch. 9 - Prob. 1CQCh. 9 - Prob. 2CQCh. 9 - Prob. 3CQCh. 9 - Prob. 4CQCh. 9 - Prob. 5CQCh. 9 - Prob. 6CQCh. 9 - Prob. 7CQCh. 9 - Prob. 8CQCh. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Prob. 11CQCh. 9 - Prob. 12CQCh. 9 - Prob. 13CQCh. 9 - Prob. 14CQCh. 9 - Prob. 15CQCh. 9 - Prob. 16CQCh. 9 - Prob. 17CQCh. 9 - Prob. 18CQCh. 9 - Prob. 1PACh. 9 - Prob. 2PACh. 9 - Prob. 3PACh. 9 - Prob. 4PACh. 9 - Prob. 5PACh. 9 - Prob. 6PACh. 9 - Prob. 7PACh. 9 - Prob. 8PACh. 9 - Prob. 9PACh. 9 - Prob. 10PACh. 9 - Prob. 11PACh. 9 - Prob. 12PACh. 9 - Prob. 1CCh. 9 - Prob. 2C
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- A certain process is under statistical control and has a mean value of μ = 130 and a standard deviation of σ = 8. The specifications for this process are USL = 150, LSL = 100.a. Calculate Cp and Cpk.b. Which of these indices is a better measure of process capability? Why?c. Assuming a normal distribution, what percent of the output can be expected to fall outside the specifications?arrow_forwardIf the process capability ratio of a centered process is 0.7, and the process mean is 76, what is the average amount of defects per 1 million outputs? a. 16395 b. 35729 c. 71861 d. 51176arrow_forwardA process has an estimate Sigma Capability of 3.8. What is the dpmo, assuming the process is shifted 1.5 sigma units from its target value?arrow_forward
- The zero-defects approach is best defined as the quality control technique a. designed to improve the product or service output to be 99.97 percent perfect. b. in which an organization works toward making its goods and services free of problems. c. in which the employees look for defects in parts, finished goods, or other outcomes selected through a sampling technique. d. in which the top performer of a process is identified and imitated.arrow_forward50 motor generators are inspected per day from a stable process. The best estimate of the fraction of nonconforming is 0.076. Determine the centeral line and control limits. On a particular day, 5 nonconforming generators were discovered. Is this process in or out of control? For the information given in the problem, construct a np-chartarrow_forwardSuppose that a processoutput is normally distributed with a mean of 30.0 and a variance of 1.44. If the specifications are 30.0 /- 3.25, then compute process capability indices. Is the process capable of meeting specifications?arrow_forward
- Process capability analysis: The specified limits for a product are 75 for the upper limits and 69 for the lower limit with a standard deviation of 1.79. Find Cp. What can we say about the process' capabilities?arrow_forwardGE adopted Six Sigma from Motorola in 1995, Which of the following is not an advantage of using Six Sigma : Select one: A. A decrease in customer satisfaction B. Defect reduction C. Process improvement D. Product improvementarrow_forwardStudies on a machine that molds plastic water pipe indicate that when it is injecting1-inch diameter pipe, the process standard deviation is 0.05 inches. The one-inchpipe has a specification of 1-inch plus or minus 0.10 inch. What is the processcapability index (Cp) if the long-run process mean is 1 inch?arrow_forward
- If the process capability index (Cp) calculates to be 1.4 then you would conclude a.The process is not stable b.The process is stable c.The process is not capable d.The process is capable e.The process should be scrappedarrow_forwardA metal fabricator produces connecting rods with an outer diameter that has a 1 ± .01–inch specification. A machine operator takes several sample measurements over time and determines the sample mean outer diameter to be 1.002 inches with a standard deviation of .003 inch.a. Calculate the process capability index for this example.b. What does this figure tell you about the process?arrow_forwardSpecifications for a metal shaft are much wider than the machine used to make the shafts is capableof. Consequently, the decision has been made to allow the cutting tool to wear a certain amountbefore replacement. The tool wears at the rate of .004 centimeter per piece. The process has a naturalvariation, σ, of .02 centimeter and is normally distributed. Specifications are 15.0 to 15.2 centimeters.A three-sigma cushion is set at each end to minimize the risk of output outside of the specifications.How many shafts can the process turn out before tool replacement becomes necessary?arrow_forward
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