STANDARD DEVIATION

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M L Dahima
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STANDARD DEVIATION

Postby M L Dahima Sat Jun 21, 2014 12:59 pm

Following question is from PM Study:
Optimistic Estimate -- 10 days
Pessimistic Estimate -- 16 days
Most likely Estimate -- 13 days
if your company has a quality requirement of Six sigma what is the duration within which task must be completed.

Answer is given 7 days to 19 days.

They considered +/- 6 sigma
whether this is correct ?
My thinking is 6 sigma means +/- 3 sigma
please suggest correct choice.
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saket
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Re: STANDARD DEVIATION

Postby saket Sat Jun 21, 2014 1:11 pm

You may wana check this out : viewtopic.php?f=11&t=311&p=980
Explore our online PMP Program , it makes PMP Easy :-) http://goo.gl/ZmD3xF

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M L Dahima
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Re: STANDARD DEVIATION

Postby M L Dahima Sat Jun 21, 2014 3:58 pm

OK, Saket
if we go as per (Rita ) +/- 6 sigma, it means 99.9999998 % data above mean and same percentage of data below mean. :roll: :roll:
But 6 sigma process means 99.999998% data within control limits - between UCL & LCL.
what is the final to follow :cry:
harin4627
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Re: STANDARD DEVIATION

Postby harin4627 Sat Jun 21, 2014 4:01 pm

I think there is a confusion between range of sigma. -/+ 3 sigma gives the range as "6 sigma range" from the upper to lower from the mean. But when it is not mentioning about range, 6 sigma means 3.4 mistakes/deviation out of 1 million.(99.99966% accuracy). So in this question limits becomes +-6 (in terms of range 12 sigma)

am I right?
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saket
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Re: STANDARD DEVIATION

Postby saket Sat Jun 21, 2014 4:29 pm

I go with harin4627, at least for PMP Exam :) , M L Dahima give the exam now...you are more than ready.
Explore our online PMP Program , it makes PMP Easy :-) http://goo.gl/ZmD3xF

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