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Control Chart

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nagarwal
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Control Chart

Postby nagarwal Sun Jul 27, 2014 11:22 am

A project manager was studying a control chart. He found that last 12 weights were produced outside the upper control limit. What should the project manager do?
1)Work to meet ISO 9000 standards
2) Plan to rework on the 12 weights
3) Stop production
4) Look for non random causes of varioation

Source: Aptech test
mandarapu
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Re: Control Chart

Postby mandarapu Sun Jul 27, 2014 11:41 am

Option 4 - 1st option
Option 3 - 2nd option
mandarapu
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Re: Control Chart

Postby mandarapu Sun Jul 27, 2014 12:16 pm

Sorry it is not 4 definitely but it between 2 and 3.with the data available - stopping production is too much so my option is 2 per the data given in the question. If at all additional data was given how many errors out of total sample points - using 1 or 2 or 3 sigma- decision can be taken to stop production.This is my take.
nagarwal
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Re: Control Chart

Postby nagarwal Sun Jul 27, 2014 12:29 pm

Namita - Could you comment?
sunku65
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Re: Control Chart

Postby sunku65 Sun Jul 27, 2014 3:45 pm

3. Stop Production.

It is totally out of Control. Rita 306(Out of Control).

If won't stop production and tries to Rework those of 12 weights. Then further production also need to Rework continuously.
mandarapu
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Re: Control Chart

Postby mandarapu Sun Jul 27, 2014 4:46 pm

Sunku : I donot see any clue from page 306 - as to how decided to 'stop production' if 'out of control'.
Namita: Comments please ?.
pankaj.barnwal
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Re: Control Chart

Postby pankaj.barnwal Mon Jul 28, 2014 8:52 am

Stop production and revisit what is the issue.
there is no point in continuing.
namita
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Re: Control Chart

Postby namita Mon Jul 28, 2014 11:39 am

I agree to most of you that we should stop production. Reason? this is a clear out of control process. We need to always remember that process will be out of control even if 1 reading is out of control limit and this case its 12... so definitely something needs to be fixed immediately
dipti5ece
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Re: Control Chart

Postby dipti5ece Mon Dec 01, 2014 8:28 am

what if the question had mentioned 8 wts? instead of 12...then would it be 3 or 4 ?
signor_rk
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Re: Control Chart

Postby signor_rk Mon Dec 01, 2014 11:46 am

hi Dipti,

As mentioned above by Namita , it will still be Option # 3) , if it is 8 weights or even 1 weight !!!
Regards ,

Ranjit

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