John David Hayes's Page

Every Quality sample (5 or 10 per hour) pulled from the process for inspection represents a hypothesis Test.

The null hypothesis is “business as usual – nothing out of the ordinary is happening”.  Therefore, the Quality has not changed in the process so the process is in control.  In hypothesis testing, the null hypothesis is assumed to be true unless we have overwhelming evidence to the contrary.  The null hypothesis gets the benefit of the doubt.

The alternative hypothesis is…

Today, while driving to work, I was thinking about how hard it is to work with a “continuous improvement” approach.  The company you are working for needs improvements that will have a big impact on the bottom line.  This push for big impacts soon is almost contrary to the Lean approach which is methodical small improvements with an aim at perfection.

Lean workers are we aiming at perfection with such intent that we don’t concentrate on “better”?  An article that I read recently…

Statistics consists of Descriptive and Inferential Statistics.

Using Descriptive Statistics we condense a set of known numbers into a few simple values (either numerically or graphically to simplify an understanding of those data).  This is analogous to writing a summary of a lengthy book.  The summary includes the mean, process location, standard deviation, spec limits, control limits, distribution and…

Has the poor economy in the US relieved CEO’s, VP’s and other managers from working to keep the “Bright Stars” in their organization?  What is a “Bright Star” (BS)?  A  BS is an employee that is making significant contributions to your organization to aid you in achieving the goals you have set for the organization.  In addition, he is an employee that will commit to taking on additional projects (over and above his present job) to assist in defining other opportunities of potential…