Vol. 11, No. 1

January 2009

PQ Systems

Quality brain workout

Dumping control chart data into handy ‘containers’

Quality Quiz: With a video!

Data in everyday life

DOE with Jackie Graham

Bytes and pieces

FYI: Current releases


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Quality Quiz from Professor Cleary

"B" is correct.

Click here for a more complete video explanation

Will Ressque may have an opening with Mr. Drecters and his daughter if he learns this simple tool.

If two variables are related to each other in some way--as pH and time are in the example--a tool that can provide insight into the quality of the relationship is correlation analysis, or scattergrams. In cases where it can be determined that one factor has an effect on the other, this is known as regression analysis.

In regression analysis, the variable that is being predicted (pH levels, in this case) is called Y (dependent variable), and the one that causes the changes is known as the independent variable. (In this example, this would be time.) If Will were to use a scattergram to evaluate pH levels over time, it might look like this:

To access a more complete discussion of regression, including explanations of how to create scattergrams and when to use them, view this excerpt from Practical Tools for Continuous Improvement Vol. I, Statistical Tools.

This discussion is taken from Practical Tools for Continuous Improvement Vol. I, Statistical Tools, a component of the Total Quality Transformation training system. Call our toll-free number, 800-777-3020, for more information about these materials.


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