The request
“Create a bell curve for Springfield bottling 500 ml fills from 488 to 512 ml in two-ml intervals, peaking at 500 ml with relative frequencies 1, 3, 7, 14, 22, 30, 34, 30, 22, 14, 7, 3 and 1.”
Then tryAdd specification limits at 490 ml and 510 ml.Change the center volume to 502 ml.
What is in this drawing
Read the decisions behind it.
01Center the process
Compare the peak with the target fill.
02Assess spread
Watch how widely fills vary.
03Set limits
Relate the distribution to specifications.
Use for continuous manufacturing measurements collected in comparable conditions.
More like this
Other examples in this family.
FAQ
Common questions
Why use a bell curve for fill volume?
Fill volume is continuous data that can often be summarized by center and spread.
What does a shifted peak mean?
It can indicate that the process average has moved away from the target.
Do specification limits appear automatically?
No. Add the applicable limits to compare the process with its requirements.