Intro to SPC

Two types of variation are __________.

Common cause and special cause

A __________ is a graphic method to show how the data is distributed across the range of values.

Histogram

Workers perform __________ to control product quality, develop SPC charts, and determine if parts meet specifications.

Inspections

Random parts should be selected from a production run for inspection because __________.

It is the best method to ensure the sample is representative of the typical characteristics of the production run

Parts are inspected __________ to make sure the typical characteristics of a produced parts are found.

Randomly

Production departments develop a quality history database by __________.

Recording inspection data

The Cpk is a statistical process control term that describes the __________.

capability of a process

A bell-shaped curve that results from a large group of measurements is the basic concept of __________.

central tendency

Statistical process control (SPC) is used to __________.

determine when bad parts will be produced before it happens

If the histogram of a process is not bell-shaped, then the process is __________.

not stable

Once the Cpk of a process is determined, it can predict the __________ of a product as long as the process __________.

quality, remains in control

To save money using SPC, a factory determines if there is a(n) __________ in a process.

special cause variation

When constructing a histogram, no value should ever fall on a(n) __________.

- Boundary

If a sampling plan requires 5 percent of the parts to be inspected, how many parts should be inspected in 1,000 parts?

50

A 100% inspection of a new product revealed that a run of 200 parts resulted in several parts being rejected. If the rejection rate was 3%. How many bad parts were created?

6

If 200 parts are sampled from every 3000 produced, what is the sampling rate?

6.7 percent

A histogram is one type of tool that can be used to __________.

Measure process control

Predicting the percentage of parts that will fall within certain measurements if the data is distributed normally is done by calculating the __________.

Standard deviation

SPC stands for __________.

Statistical Process Control