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Chapter 2: Q.13-8CQM (page 344)
Question:If the process could be improved so that the standard deviations were only about .10 millimeters, what would be the best that could be expected with the processes relative to fraction defective?
Answer
We can expect about 1.9 defective fractions from the given processes.
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What are the Three Ts relevant to poka-yokes in service systems?
Question: Dell Computer鈥檚 primary consumer business takes orders from customers for specific configurations of desktop and laptop computers. Customers must select from a certain model line of computer and choose from available parts, but within those constraints may customize the computer as they desire. Once the order is received, Dell assembles the computer as ordered and delivers it to the customer. What type of manufacturing process is described here?
A small barbershop has a single chair and an area for waiting, where only one person can be in the chair at a time, and no one leaves without getting their hair cut. So the system is rough:
Entrance Wait Haircut Exit
Assume customers arrive at the rate of 10 per hour and stay an average of 0.5 hours. What is the average number of customers in the barbershop?
You are the newly appointed assistant administrator at a local hospital, and your first project is to investigate the quality of the patient meals put out by the food-service department. You conducted a 10-day survey by submitting a simple questionnaire to the 400 patients with each meal, asking that they simply check off that the meal was either satisfactory or unsatisfactory. For simplicity in this problem, assume that the response was 1,000 returned questionnaires from the 1,200 meals each day. The results are as follows:
Number Of Unsatisfactory Meals | Sample Size | |
December 1 | 74 | 1,000 |
December 2 | 42 | 1,000 |
December 3 | 64 | 1,000 |
December 4 | 80 | 1,000 |
December 5 | 40 | 1,000 |
December 6 | 50 | 1,000 |
December 7 | 65 | 1,000 |
December 8 | 70 | 1,000 |
December 9 | 40 | 1,000 |
December 10 | 75 | 1,000 |
600 | 10,000 |
a. Construct a p-chart based on the questionnaire results, using a confidence interval of 95.5 percent, which is two standard deviations.
b. What comments can you make about the results of the survey?
Benny the Barber owns a one-chair shop. At Barber College, they told Benny that his customers would exhibit a Poisson arrival distribution and that he would provide an exponential service distribution. His market survey data indicate that customers arrive at the rate of two per hour. It will take Benny an average of 20 minutes to give a haircut. Based on these figures, find the following:
b. The average time a customer waits.
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