Customer wants a P-value with our initial Process Studies

jimmymustang06

Involved In Discussions
#1
I have a bulk product, 2nd tier supplier.. Now my customer wants a p-value with our initial process studies because Ford wants a P-value from them... This is for Length... The customer's requirement is .05 I get a .00001 from 125 readings.. What is this telling me? My process is out of control?
 
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Bev D

Heretical Statistician
Staff member
Super Moderator
#2
What is the physical test? what is the statistical test? Normality of the process results? typically a test of Normality is requested and/or advised for capability studies. if so a p value that small would indicate that you probably don't have a Normal distribtution. that doesn't mean that your process is out of control.

can you post your data?
 

Statistical Steven

Statistician
Staff member
Super Moderator
#3
I have a bulk product, 2nd tier supplier.. Now my customer wants a p-value with our initial process studies because Ford wants a P-value from them... This is for Length... The customer's requirement is .05 I get a .00001 from 125 readings.. What is this telling me? My process is out of control?
There can be SOOO many different reasons for the small p-value. Bev mentioned a few. Another thing to consider...

are you over powered? Are you detecting statistical differences that are not meaningful?

Is your variation so small that any difference is statistically significant?

Is your measurement system capable?

The list goes on.....
 
C

Cognizant

#5
if data is not normal (P value<.05), you can identify its distribution(Stat>Quality Tools>Individual Distribution Identification) through Minitab with acceptable p value and then run capability on non normal distrbution(Stat>Quality Tools>Capability Analysis>Nonnormal.

Send me the data please. I can help running the charts.
 
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