Exam 7: Process Strategies

Larry's boat shop wants to monitor the number of blemishes in the paint of each boat. Construct a 3-sigma c-chart to determine if their paint process is in control using the following data.

Pierre's Motorized Pirogues and Mudboats is setting up an acceptance sampling plan for the special air cleaners he manufactures for his boats. His specifications, and the resulting plan, are shown on the POM for Windows output below. Pierre is a bit confused. He mistakenly thinks that acceptance sampling will reject all bad lots and accept all good lots. Explain why this will not happen.

A process range chart illustrates the amount of dispersion within the samples.

Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for:

What are the three possible results (or findings) from the use of control charts?

Flowcharts use distance, but not time, to show the movement of material, product, or people through a process.

The c-chart signals whether there has been a:

An x-bar chart is used when we are sampling attributes.

Fast-food restaurants usually adopt a product-focused strategy for their processes.

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that when the process is operating as intended, packaging weight is normally distributed with a mean of twenty ounces, and a process standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each. The data from that activity appear below. (a) If he sets an upper control limit of 21 and a lower control limit of 19 around the target value of twenty ounces, the control chart is based on what value of z? (b) With the UCL and LCL of part a, what do you conclude about this process-is it in control?

A job shop is an example of a(n):

A part that connects two levels should have a distance between the two holes of 4". It has been determined that x-bar and R-charts should be set up to determine if the process is in statistical control. The following ten samples of size four were collected. Calculate the control limits, plot the control charts, and determine if the process is in control.

The x-bar chart indicates that a gain or loss of uniformity has occurred in the central tendency of a production process.

Mean charts and range charts complement one another, one detecting shifts in process average, the other detecting shifts in process dispersion.

The Central Limit Theorem states that when the sample size decreases, the distribution of the sample means will approach the normal distribution.

________ represent an organization's attempt to gain increased efficiency through specialization, which can include, for example, concentrating on certain classes of customers.

The causes of variation in statistical process control are:

The x-bar chart, like the c-chart, is based on the exponential distribution.

The Central Limit Theorem:

If = 23 ounces, σ = 1.0 ounces, and n = 16, what will be the ± 3σ control limits for the x-bar chart?