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