EBK OM
6th Edition
ISBN: 9781305888210
Author: Collier
Publisher: YUZU
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Question
Chapter 16, Problem 6PA
Summary Introduction
Interpretation: The control limits needs to be determined for p chart based on the given information.
Concept Introduction:A p chart helps in monitoring the non-conforming units proportion and improvement decisions can be made based on the control chart.
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We have taken 12 samples of 400 book pages found the following proportions of defective pages: .01, .02, .02, .00, .01, .03, .02, .01, .00, .04, .03, and .02. A page is considered defective when one or more errors are detected.
Calculate the control limits for a p control chart.
A new sample of 400 pages is taken, and 6 pages are defective. Is the process still in control?
We have taken 12 samples of 400 book pages found the following proportions of defective pages: .01, .02, .02, .00, .01, .03, .02, .01, .00, .04, .03, and .02. A page is considered defective when one or more errors are detected.a. Calculate the control limits for a p control chart.b. A new sample of 400 pages is taken, and 6 pages are defective.Is the process still in control?
A travel agency is concerned with the accuracy and appearance of itineraries prepared for its clients. Defects can include errors in times, airlines, flight numbers, prices, car rental information, lodging, charge card numbers, and reservation numbers, as well as typographical errors. As the possible number of errors is nearly infinite, the agency measures the number of errors that do occur. The current process results in an average of
five
errors per itinerary.
a. What are the
two-sigma
control limits for these defects? The
UCLc
equals
_______________
and the
LCLc
equals
____________________
(Enter
your responses rounded to three decimal
places.
If your answer for
LCLc
is negative, enter this value as
0.)
b. A client scheduled a trip to Dallas. Her itinerary contained
five
errors. Interpret this information.
A.
The number of defects is within the control limits, so it is assumed that the process is not in control.
B.
The number of defects is within the…
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- Design specifications require that a key dimensions on a product measures 346=12 units . A process is being considered for producing this product has a standard deviation of eight units. The process average has been shifted to 350 so that the process capability is 0.3333. Approximately, what percentage of items produced will be defective?arrow_forward A fast food franchise tracked the number of errors that occurred in customers orders. These included; * wrong menu items *wrong size drink *lack of condiments *wrong price total *and so on... Some orders may have more than one error. In one week, 1500 orders were filled, and a total of 72 errors were discovered. Find the control limits for a C – Chart to monitor the number of errors per order. Is order accuracy, good or bad ? Explain.arrow_forwardThe Wellington Fiber Board Company produces headliners, the fiberglass components that form the inner roofof passenger cars. Management wanted to identify which process failures were most prevalent and to find thecausearrow_forward
- Altman Distributors, Inc., fills catalog orders. Samples of size n = 100 orders have been taken each day over the past6 weeks. The average defect rate was .05. Determine the upper and lower limits for this process for 99.73% confidence.arrow_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_forwardA 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) .arrow_forward
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- If a process is neither capable nor in control, which of the following is the first step to be taken? 1) Redesign the equipment 2) Remove sources of special causes of variation 3) Determine the process capability index 4) Remove common causes of variationarrow_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_forwardWhy is it because testing can only determine whether or not errors have occurred, but not whether or not there have been no errors?arrow_forward
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