Quality Management
Instructor: Vi Nguyen, PhD
Global Production Engineering
Management (GPEM)
Faculty of Engineering
Vietnamese German University
Seven Basic Quality Tools (Q7) Practice
Scatter Diagram: Practice
A product development team wants to check
if the sugar content of cake affects the taste
rating. 25 samples of cake with different
sugar content are distributed to random
customers in a public area. Analyze the data
has collected in the table and check whether
there is a linear correlation between the
variables. Is it the strong or weak
positive/negative relationship?
Sugar Content
Taste Rating
10
10
4
18
9
14
8
1
11
9
6
5
8
20
9
14
7
20
12
3
6
13
20
16
48.00
42.00
18.40
84.60
37.80
58.80
39.20
8.00
50.00
35.00
24.00
19.00
34.40
84.00
36.90
67.20
34.30
82.00
54.00
14.70
24.60
61.10
96.00
70.40
Scatter Diagram
What type of correlation is shown by these graphs?
weak negative
correlation
strong positive
correlation
zero correlation
weak positive
correlation
weak negative
correlation
strong negative
correlation
Flow chart
http://www.au.af.mil/au/awc/awcgate/navy/bpi_manual/mod6-flowchrt.pdf
Flow chart
http://www.au.af.mil/au/awc/awcgate/navy/bpi_manual/mod6-flowchrt.pdf
Flow chart
Using the information provided in the given text, draw a flow chart describing the different stages
involved in the making of coins
Production of coins at the mints is a complete process. It starts with the buying of unmixed metals
and their testing by the Assay Department. Then the metals are alloyed in oil-fired or electric arc
furnaces, and cast into ingots 40 cm wide, 15 cm thick and 6 m long. These ingots are reheated
until the temperature is hot enough for hot rolling. During this stage, the ingots pass through a
series of rollers until they form long, thin sheets which are of the thickness of a coin. From these
thin strips, blank discs are punched. These are the basic raw materials for the manufacture of coins.
The blanks are heated to soften them, and they are rolled so that the rim is raised. Finally they are
stamped with the design of the coin. At every stage, defective pieces are carefully sorted out, and
(with the frequent checking and returning points) strict quality control maintained. Rejects are
returned to the alloying stage, together with the waste from the alloy strip.
http://www.au.af.mil/au/awc/awcgate/navy/bpi_manual/mod6-flowchrt.pdf
Cause and Effect Diagram
You experience bad downtime with your Laptop.
Draw up a fishbone diagram to identify, sort, and
display possible failure causes for this problem.
https://conceptdraw.com/a2300c3/preview
Cause and Effect Diagram
You experience poor gas mileage with
your motorbike. Draw up a fishbone
diagram to identify, sort, and display
possible failure causes for this problem.
1. A quality control team in a Vietnamese company reported the defects in their
production line. Draw Pareto diagrams to determine the 3 main errors that need to be
addressed. Annotate and explain the results of the presentation
No.
1
2
3
4
5
6
7
8
9
10
Lỗi phát sinh
Defects
Lõm bề mặt
Cong vênh
Thiếu liệu
Ba vớ
Đường chảy liệu
Bọt khí-rỗ khí
Đường kết nối
Vết nứt
Trầy xước
Khác
Số lượng
Quantity
3500
1587
998
645
327
189
157
132
111
99
Chi phí làm lại sản phẩm của 1 lỗi
(USD)
Cost per unit
20
7
35
60
3
5
12
40
12
14
2. You experience poor gas mileage with your motorbike. Draw up a fishbone
diagram to identify, sort, and display possible failure causes for this problem.
1. A quality control team in a Vietnamese company reported the defects in their production line.
Draw Pareto diagrams to determine the 3 main errors that need to be addressed. Annotate and
explain the results of the presentation
No.
1
2
3
4
5
6
7
8
9
10
Lỗi phát sinh
Defects
Đường chảy liệu
Bọt khí-rỗ khí
Ba vớ
Vết nứt
Lõm bề mặt
Cong vênh
Thiếu liệu
Đường kết nối
Trầy xước
Khác
Số lượng
Quantity
2500
1823
1687
901
800
624
421
321
125
98
Chi phí làm lại sản phẩm của 1 lỗi (USD)
Cost per unit
20
7
35
60
3
5
15
23
50
14
A quality control team in a Vietnamese company reported the defects in their production
line. Draw Pareto diagrams to determine the 3 main errors that need to be addressed.
Annotate and explain the results of the presentation
No.
1
2
3
4
5
6
7
8
9
10
Lỗi phát sinh
Defects
Trầy xước
Cong vênh
Vết nứt
Ba vớ
Thiếu liệu
Bọt khí-rỗ khí
Lõm bề mặt
Đường chảy liệu
Đường kết nối
Khác
Số lượng
Quantity
2221
1612
1311
969
888
621
358
223
128
67
Chi phí làm lại sản phẩm của 1 lỗi
(USD)
Cost per unit
20
7
35
60
3
5
15
10
35
14
Apply
quality
tools in
A3
Report:
Manpower
Method
Environment
PROBLEM
Material
Cause No.
Identified Root Cause
Machine
Potential Solution