Exam 17: Process Improvement Using Control Charts

A(n)_____ process has the ability to produce products or services that meet customer requirements.

As the standard deviation of a process ___________,the process capability measured by Cpk________.

A bank officer wishes to study how many customers write bad checks.To accomplish this,the officer randomly selects a weekly sample of 100 of checking accounts,and the number of who wrote bad checks was recorded.The numbers of customers who wrote bad checks in 20 consecutive weekly samples of 100 cardholders are,respectively, 1,4,9,0,4,6,0,3,8,5,3,5,2,9,4,4,3,6,4,0 Find the LCL and UCL for the p-chart.

_______ chart monitors the number of nonconformities units in a subgroup.

The quality of an electronic component used in manufacturing cell phones is monitored with a p-chart.In the last 20 days daily samples of 75 units resulted in the following number of defective units per sample: 8,4,3,7,3,1,0,7,4,2,0,1,6,2,4,3,1,2,8,5 Find the appropriate center line.

A bank officer wishes to study how many customers write bad checks.To accomplish this,the officer randomly selects a weekly sample of 100 of checking accounts,and the number of who wrote bad checks was recorded.The numbers of customers who wrote bad checks in 20 consecutive weekly samples of 100 cardholders are,respectively, 1,4,9,0,4,6,0,3,8,5,3,5,2,9,4,4,3,6,4,0 On the basis of the limits established,if the bank finds that 12 customers in next week's sample of 100 cardholders have written bad checks,should the bank believe that there has been an unusual variation in the process?

If = 5.2, = .3,and n = 4,and if specifications are (4.6,5.8),is the process capable?

Assume that 25 samples of 50 each are taken and the total number of defectives is 34. Calculate .

If the ________ limits are within the ________ limits,then it can be concluded that the process is __________.

Common causes of variation represent the inherent variability of a given process.

A control chart on which subgroup ranges are plotted versus time is a(n)_____ chart.

An chart is a control chart on which individual process measurements are plotted versus time.

Sources of process variation that are inherent to the process design are called _____ causes of variation.

A control chart is a graph whose purpose is to detect assignable causes of variation in a process.

How well a product or service performs in the marketplace is called:

A manufacturer of windows produces one type that has a plastic coating.The specification limits for the plastic coating are 30 and 70.From time to time the plastic coating can become uneven.Therefore,in order to keep the coating as even as possible,thickness measurements are periodically taken at four different locations on the window.15 subgroups were observed and each subgroup consists of the four thickness measurements taken across the windows at a particular time with the following results: mean of the means = = 50.05 and the average range of 8.85. Calculate the control limits for the R chart.

For a manufacturing process, = 10 inches, = .4 inches and the subgroup sample size is 6 units. Calculate the natural tolerance limits for this process.

_________ is the international standards on quality management and quality assurance systems.It establishes processes for assuring that goods and services offered by the company meet a consistent level of quality acceptable to customers.

Process leeway is the distance between natural tolerance limits and control limits.

In 25 samples of 100 units each,75 units were found to be defective.Find the appropriate UCL and LCL for the p-chart.