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