Statistics in SPC

In this unit we will look briefly at the statistical background to SPC. On completion you will be able to:

• describe the concept of sampling
• describe its application within SPC
• state briefly the relationship between Probability Theory and SPC
• differentiate between Variable data and Attribute data as these terms are used within SPC
• describe what is meant by the term Normal Distribution
• state the importance of the Normal Distribution within SPC
• describe a Skewed Distribution, and distinguish between positive and negative skew
• describe the importance of the value of the three Standard Deviations within SPC

This unit should take about 20 minutes to complete.