Vol. 12, No. 1
January 2010
PQ Systems
Tweet with us on TwitterRead our Quality Blog

Send Quality eLine
to a friend!

Just type in your friend's email below:


Sign up
If you received this newsletter from a friend and want your own subscription to Quality eLine, click below.

Subscribe to Quality eLine




Quality Quiz from Professor Cleary

Cal Lesterol is a technician in the quality department of Fourlegs Furniture Manufacturing. His boss, Les Casteroyl, wants him to take greater initiative in presenting data to management, so when Cal brings Les a scatter diagram, Les is interested. He had prepared the chart to show that when the outside temperature went up, the number of defects in the chair leg assembly went down. His first thought was that Fourlegs might want to relocate its plant to a climate with more hot days, but since he knew that this suggestion was impractical, he had gone to Les to ask what he should do with the data that he had charted. The scatter diagram appeared as follows:

"I think it's time for you to present it to the management team," his boss responded. Cal prepared his presentation, using elaborate color schemes to identify the dependent and independent variables, and to label the X and Y axes. It was a beautiful visual aide, he thought. Unfortunately, however, someone asked him to explain what the implications were for what was labeled as the "t-statistic." Panicked as well as clueless, Cal responded vaguely that the t value represents the number of defects for each unit of temperature (t). Was Cal Lesterol correct in this explanation?

a) Yes

b) No


Click here for a more complete video explanation

Copyright 2010 PQ Systems.
Please direct questions or problems regarding this web site to the Webmaster.