1. Within the context of Statistical Process Control, please explain the differences between (25 points):
   1. Defects and defectives (5 points)

1. Variable data and attribute data control charts (5 points)

1. Common and special causes of variation (5 points)

1. Control limits and specification limits (5 points)

1. In control and out of control processes, i.e. how you know which you are dealing with, what they mean and how they are managed (5 points)