CQE Exam Problem

R

RakeshGang

#1
Hello All,

While preparing for the exam, came across this question and struggling to find the procedure to get the Answer given.

Four ingredients are blended to make a final product. Using the data below, what is the expected weight and variation of the final product ?

Thanks in advance.

Regards,
Rakesh
ADMINISTRATOR NOTE: I assume this is from exam prep material. It is probably copyrighted so it can not be reprinted here. I have edited the post. I apologise for the inconvenience,but I have to make sure there are no copyright complaints.
 
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Michael_M

Trusted Information Resource
#2
Can you give us an example:

8.8 pounds Milk
1 pound peanuts
2.5 pounds chocolate
1 pound brown sugar.

then ask a similar question?

Note: don't ask the exact question, but something similar should work
 
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R

RakeshGang

#3
Thanks Michael for your response.
I didn't expect that the question would be removed.
I am not really worried about the weights, I am just struggling to find logic for the answer.

8.8 pounds Milk
1 pound peanuts
2.5 pounds chocolate
1 pound brown sugar.

If all these four ingredients are blended, what would be the expected weight and variation of the final product ?

Regards,
Rakesh
 

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#4
You have to know the variation in the four input streams. Generally the problem would have given weights of the four input streams over several mixings so you may calculate the standard deviations, or they will provide the input streams.

Assuming independence between the inputs, you would take the square root of the sum of the squares of the standard deviations.

See http://www.stat.yale.edu/Courses/1997-98/101/rvmnvar.htm as one example explanation.
 
R

RakeshGang

#5
Thank you very much Steve. The link is very helpful for me.

According to the Question, we need find the expected variation. So I believe variation can be in 3 forms. Range, Standard Deviation and Variance.

So I am struggling to find whether we need to consider Standard Deviation or Variance of combined individual variances.

Thanks,
Rakesh
 

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#6
Range is generally not used, except in the context of a X% confidence interval. Variance is the square of the standard deviation. So you add variances, or add the squares of the the standard deviation (to convert to variance) and then take the square root (to convert back to standard deviation).
 
K

kendal98

#8
CQE Study Material

Hello!!

I will be taking the CQE exam in 2014.

I am looking for study material to purchase.

Anyone have anything that may be good study material for the CQE Exam?

Please Advise.

Thank you!!!
 

Ron Rompen

Trusted Information Resource
#9
The CQE Guide (Indiana Press?) is a great tool. Uses the same format as the exam does, and covers the entire body of knowledge.
 
R

RakeshGang

#10
Re: CQE Study Material

Hello,
Sorry for late reply!
I started my preparation in August and first time attempted the exam on 07-Dec-13. During my preparation, followed ASQ CQE handbook and taken some tables in CQE primer (like various NDT techniques). But I went through the complete handbook 2 times till the exam time. After completing first revision, practiced some sample CQE exam papers, found in the web.

Finally last week, I was informed that I am ASQ certified Quality Engineer :)
If you need these files, please message me.
All the Best !!

Regards,
Rakesh
 
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