Exam 19: Statistical Process Control and Quality Management

In a control chart,expected variation is defined by the ________.

A large restaurant contracts with a local laundry to wash white napkins. The laundry returns the napkins in bundles of 100 napkins. The restaurant uses a sampling plan to make a decision to use the bundle of napkins or return the bundle to the laundry. The sampling plan uses a sample size of ten with a "number of rejects allowed" of one. If the number of dirty napkins in a sample of ten is two,what decision is made?

A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then,once the machine is running,a sample of six tubes is taken every three hours and weighed with the following results: What is X-bar for 7 am?

Which probability distribution is used to develop a control chart for sample means?

The Quality Assurance Department selected 12 samples of 100 printed circuit boards and tested them. The number of defective printed circuit boards in each sample was 3,3,0,5,1,1,5,6,6,2,0,and 1. What kind of control chart should be constructed to monitor the process?

Which probability distribution is used to develop an operating characteristic curve?

A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then,once the machine is running,a sample of six tubes is taken every three hours and weighed with the following results: What is the value of the upper control factor of the range?

A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. Over the last hundred sample means,no sample means were outside a control limit. The chart shows ________.

A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces. Then,once the machine is running,a sample of six tubes is taken every three hours and weighed with the following results: What is the range of the samples at 7 am?

These are examples of attributes: the width of a cracked weld; the length of time that a relay works; the amount of water in a radiator; the diameter of a tire.

A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. Over the last hundred sample means,one sample mean was outside a control limit. The process is ________.

A large restaurant contracts with a local laundry to wash white napkins. The laundry returns the napkins in bundles of 100 napkins. The restaurant randomly samples 10 napkins from each bundle to make sure that the napkins are clean with no stains or other defects. By sampling only 10 of the napkins,the restaurant may conclude that all of the napkins are clean and use the bundle,even when the napkins are actually dirty and should not be used. This sampling risk is called ________.

A subassembly is inspected and the number of defects recorded. A new group of assemblers began work Monday morning. The number of defects per subassembly for the first 10 they produced was: 3,2,0,5,4,6,0,7,7,and 6. What are the upper and lower limits for the c-bar chart?

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples,ΣX = 15,350 and ΣR = 411.4. What is the sample size?

Consider a company that wishes to verify that an incoming product meets the stipulated requirements by screening the products using a statistical sampling plan. If the sample inspection reveals that a lot was accepted even though it had more defects than it should,this is referred to as ________.

A sampling plan states that if 20 incoming transistors are checked and 2 or less defects are found,the lot is accepted. If an incoming lot is 10 percent defective,what is the probability of accepting the lot of transistors?

A sampling plan states that if 20 incoming bolts are checked and 2 or less defective bolts are discovered,the lot will be rejected. If an incoming lot is 10 percent defective,what is the probability of rejecting the lot?

If the upper and lower control limits are set at ±3 standard deviations from the mean,we would expect that ________.

The technique that tallies types of defects and their frequency is called ________.

The Quality Assurance Department selected 12 samples of 100 printed circuit boards and tested them. The number of defective printed circuit boards in each sample was 3,3,0,5,1,1,5,6,6,2,0,and 1. The measurement of quality is based on ________.