Exam 20: Total Quality Management

Which of the following describes the purpose of acceptance sampling (defect-detection)?

When no point lies outside the control limits of a chart,we conclude that:

Costs that occur as the result of poor quality are also known as ____________________.

The four letters in W.Edwards Deming's PDCA cycle stand for ____________________.

A random sample of 100 rods from a process with a mean of 20 feet produced a sample mean of 20.01 feet and a standard deviation of 0.015.This difference between the process mean and the sample mean is likely to be:

The visual display of effects and their possible causes as a method of problem solving is associated with a:

The Statistical Process Control (SPC)Chart was developed by ___________________________________ during the 1920s.This is a graphical procedure for determining whether a production process is operating properly.

Samples Twenty-five samples of size 4 were taken from a production process.The mean of the sample means is $\bar {\bar x}$ = 13.9.The process standard deviation is known to be $\sigma$ = 3.5.The sample means are listed below. Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 15.1 10.9 17.6 10.0 13.8 9.9 17.7 6.1 5.9 16.9 11.1 12.1 9.4 Sample 14 15 16 17 18 19 20 21 22 23 24 25 13.2 11.1 16.9 9.3 10.0 12.0 18.2 21.1 21.7 16.9 19.1 21.5 -Is the process under control? Discuss.

Six Sigma is a philosophy that focuses on small,ongoing improvements rather than relying on large-scale innovations,such as might come from advances in technology or equipment.

Which of the following statements are not true?

Bottles A bottle filling machine fills bottles with 16 oz of soda.Each hour,3 bottles are weighed on a precision scale to determine if the process is under control.The following data has been collected from the last 4 hours.Each value in the table represents the weight of an individual bottle. Time Bottle 1 Bottle2 Bottle 3 7AM 16.3 16.4 15.8 16.0 16.2 16.4 9 AM 15.7 16.1 16.3 16.0 15.9 16.2 -Assuming this data was collected when the process was operating satisfactorily,construct 3-sigma limits for the mean chart.

Although both statistical process control (SPC)and acceptance sampling make inferences on the basis of samples,SPC uses sampled products to make inferences about a larger population of the products,while acceptance sampling uses the sampled products to make inferences about the process from which they came.

What is a "check sheet" and what is its role in total quality management?

Summarize the steps of the Deming cycle.

Twenty-five samples of size 4 were drawn from a production process. For each sample, the mean and range were computed as shown below. Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 21 24 20 18 20 21 23 25 15 20 25 21 4 8 12 7 19 6 11 8 8 7 13 9 13 25 Sample 14 15 16 17 18 19 20 21 22 23 24 25 28 14 22 24 26 19 14 28 17 26 29 15 12 14 17 8 21 12 14 11 7 15 21 19 -Does it appear that the process is under control? Explain.

When a given process is operating properly,the percentage of defectives is 10%.For a 3-sigma p-chart in which the upper and lower control limits are 4 percentage points apart,how large will each sample have to be?

When the purpose of sampling is to detect when a process becomes too variable,the chart of choice will be an R chart.

Costs of preventing poor quality are also known as ____________________.

Random samples Random samples of 200 parts were taken on an assembly line every hour for the past 25 hours. The number of defective parts is shown in the accompanying table. Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 Number of defectives 5 2 4 10 2 6 8 2 0 5 12 11 8 Sample 14 15 16 17 18 19 20 21 22 23 24 25 Number of defectives 10 5 13 7 5 7 11 3 16 3 2 10 -Calculate the centerline and control limits for the p-chart. Centerline = ____________________ Lower value = ____________________ Upper value = ____________________

If six points in a row are all headed either upward or downward,or if nine points in a row are on the same side of the centerline,the process is judged to be out of control.