Chapter 7. Median & Range Charts. If the distribution is normal, then mean=median=mode If R is in control and distribution is normal, then alternatively you can plot the medians Disadvantage: Less sensitive to changes in the average Advantage: Simpler to use .
For the median control chart:How to calculate control limits
For the mean control chart:How to calculate control limits
In industry, there are many different types of processes. The main types, along with a brief description of each are listed below:
Statistical “process” control or statistical “part” control?
Note:Your book uses a term called the “T test” – don’t confuse this with the student-t test, commonly referred to as the “t-test”