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# ENTR 3130 Lecture 07B - SPC

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on 11 February 2016

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#### Transcript of ENTR 3130 Lecture 07B - SPC

Statistical Process Control
The purpose of an SPC charts is to use statistical methods to monitor whether your process is in control
What does control mean?
Achieving and maintaining quality is a hard and costly process the requires constant vigilance and improvement.
High quality is not something you ever attain; it is something you always strive for.
Wrap Up
Let's look at question 2A (page 416
STEP 1 Does this question use continuous or discrete data?
STEP 2 For our sample, do we have an n=1, or n>1
STEP 3 Given that, what type of SPC chart should we make (see Fig 10-15 on page 410)
STEP 4 Find the right equation to use, and find the numbers to put into each variable.
STEP 5 You'll notice we have this variable z. WTF?
STEP 6 Calculate UCL & LCL
STEP 7 Completed question 2B
So, that's a mean chart. What's the difference between a mean and a range chart? Why is it important to do both?
What if I'm lazy and I don't want to calculate the standard deviation of my sample?
I know, standard deviations are a pain to calculate. Don't worry, though.
See question 3A on page 416
Here, we use a new equation that uses average ranges instead of standard deviations
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