Queries on Six Sigma Concepts
Six Sigma – iSixSigma › Forums › Old Forums › General › Queries on Six Sigma Concepts
 This topic has 2 replies, 2 voices, and was last updated 18 years, 9 months ago by Aman.

AuthorPosts

February 22, 2004 at 2:31 pm #34677
Dear Sir,
Following is the assignment came to me following a 6 Sigma assignment with small company. Being, out of touch with 6 Sigma and statistical Concept since 2 years (Currently I m in Software Quality Assurance), I request to you to help me by providing guidelines on how to approach on following real life situations.
Your answers will also be used to select/choose our six sigma guide/mentor/MBB for 6 sigma implementation.
Below are the set of 10 Situations on which I need your short comments. You are not suppose calculate and give complete analysis, but only display your approach to the problem solution step by step and analysis of output/Graphs as in Minitab.
Your early reply will be appreciated.
Thx and Regds
Aman
Situations
1. Conduct a Gage R & R study of the following data, where five parts are evaluated twice by two appraisers (A & B).Appraiser A
Appraiser B
Part
1
2
3
4
5
1
2
3
4
5
1
113
113
71
101
113
112
117
82
98
110
2
114
106
73
97
130
112
107
83
99
108
Utilize specification limits of 100 +/ 20.
2. Dice Exercise: Each person in a workshop rolls a die 25 times, records the number of times each number appears, and calculates an average value. The instructor collects from attendees the total number of times each number is rolled and plots the information. Average values from all attendees are collected and plotted in a histogram format. Note the shape of each curve.
3. From curve of the average rolls of the die (or averages of card draws), estimate the range of roll mean values that are expected for 25 rolls of the die 90% of the time. Describe how the distribution shape of mean values would change if there were 50 rolls of the die.
4. A part is not to exceed a failure rate of 3.4 failures in one millionDetermine the sample size needed for a hypothesis test of the equality of this failure rate to a 3.4 ppm failure. Use risks of 0.05 and an uncertainty of + 10% of the failure rate target
Determine the sample size if one failure were permitted with a 95% confidence statement (using a reduced sample size testing approach)
Determine the failure rate of the sample f two failures occurred during the testing (using a reduced sample size testing approach)
Comment on your results and implementation challenges
Solve the problem with failure rate 4.3 dpm
5. A manufactured wants to select only one supplier of a key part that is used in the manufacturing process. The cost for parts from supplier A is greater than that for supplier B. A random sample of 1000 parts was taken from each of the suppliers processes. The output from each sample was compared to the specifications. Suppliers A had 10 parts beyond the specification limits, while supplier B had 15.Determine if there is a significance differences at a level of 0.1
Comment on the findings and make recommendations.
6. Fabric is woven on a large number of looms. It is suspected that variation can occur both within the samples from fabric from the same loom and between different looms. To investigate this, four looms were randomly selected and four strength determinations were made on the fabric that was produced. Conduct a variance of components analysis of the data.Looms
Observations
1
2
3
4
1
98
97
99
96
2
91
90
93
92
3
96
95
97
95
4
95
96
99
98
7. The breaking strength of a fiber is studied as a function of four machines and three operators using fiber from one batch. Using computer software, analyze the following data and draw conclusions. Comment on how these variables could be related to a transactional process.Operator
Machine
1
2
3
4
1
109
110
108
110
110
115
109
108
2
110
110
111
114
112
111
109
112
3
116
112
114
120
114
115
119
117
8. Conduct a multiple regression analysis of the four factors on cycle time. Comment on the results. Determine the expected value for Y given A = 93.1A
B
C
D
Cycle Time
63.8
30.13
26.11
25.60
442.75
64.3
30.36
26.10
25.36
444.36
62.9
31.05
26.02
25.20
444.82
66.9
30.13
25.97
25.36
445.51
69.7
29.90
26.02
25.60
446.43
70.0
30.13
26.03
28.00
467.59
72.2
31.05
25.94
27.44
472.88
73.9
30.13
25.94
27.20
478.86
69.6
31.05
25.99
28.00
477.25
72.4
31.28
25.94
27.20
478.86
64.9
31.05
25.97
29.60
491.97
74.3
31.28
25.97
29.28
492.43
74.8
31.28
25.94
28.56
493.58
9. Create a twofactor interaction plot of the following data:Temperature
Pressure
Response
100
250
275
100
300
285
120
250
270
120
300
325
Determine what parameter settings yield the highest response.
Determine what parameter settings would be the best if it were important to reduce the response variability that results from frequent temperature variations between the two extremes.
10. Create a 16 trial full factorial when the factors have two levels. Determine the contrast columns for all interactions and list them with the factorial design. Comment on the frequency of the +s and s in each columns0February 23, 2004 at 4:49 am #95914
John Q PublicParticipant@JohnQPublic Include @JohnQPublic in your post and this person will
be notified via email.Excuse me but WHY do you need this?
This looks like a certification exam of some sort.0February 23, 2004 at 6:00 am #95915Yeah it may seems to be that but these are masked situation explaining real life situation at one electronics manufacturing set up.
Please give your comments if possible illustatrating the way to approach them.
THx and Regds0 
AuthorPosts
The forum ‘General’ is closed to new topics and replies.