Stats
Common sources of confusion in a class on quality control (August 22,
2007) Category: Control charts
I presented a training class:
for the American Society for Andrology. The major emphasis was on the
computation of control charts. It's always interesting to see how
this material goes over. This group was somewhat math-phobic, and felt a
certain level of discomfort with the required exercises. Several points of
confusion involved
- how to calculate standard deviations with a calculator that does not
have a memory,
- some of the data was presented as proportions and some of it was
presented as percentages,
- the definition of "n" in the P chart--it is the denominator of the
proportions rather than the number of proportions.
You can't expect a class like this to go perfectly, but I will try to pay
closer attention to these issues the next time I teach this class.
07/08/2008.
