Scatter Diagram of Investigative Data
Notice that each sample is represented by two readings, one for fan speed and one for particulate count. In order to plot this data as a scatter diagram, we will measure the fan speed (cause) on the X-axis, and the particulate count (effect) on the Y-axis.
Sample Number |
Fan Speed |
Particles per Cu Meter |
|
Sample Number |
Fan Speed |
Particles per Cu Meter |
1 |
8.1 |
1046 |
26 |
8.0 |
1040 |
|
2 |
7.7 |
1030 |
27 |
5.5 |
1013 |
|
3 |
7.4 |
1039 |
28 |
6.9 |
1025 |
|
4 |
5.8 |
1027 |
29 |
7.0 |
1020 |
|
5 |
7.6 |
1028 |
30 |
7.5 |
1022 |
|
6 |
6.8 |
1025 |
31 |
6.7 |
1020 |
|
7 |
7.9 |
1035 |
32 |
8.1 |
1035 |
|
8 |
6.3 |
1015 |
33 |
9.0 |
1052 |
|
9 |
7.0 |
1038 |
34 |
7.1 |
1021 |
|
10 |
8.0 |
1036 |
35 |
7.6 |
1024 |
|
11 |
8.0 |
1026 |
36 |
8.5 |
1029 |
|
12 |
8.0 |
1041 |
37 |
7.5 |
1015 |
|
13 |
7.2 |
1029 |
38 |
8.0 |
1030 |
|
14 |
6.0 |
1010 |
39 |
5.2 |
1010 |
|
15 |
6.3 |
1020 |
40 |
6.5 |
1025 |
|
16 |
6.7 |
1024 |
41 |
8.0 |
1031 |
|
17 |
8.2 |
1034 |
42 |
6.9 |
1030 |
|
18 |
8.1 |
1036 |
43 |
7.6 |
1034 |
|
19 |
6.6 |
1023 |
44 |
6.5 |
1034 |
|
20 |
6.5 |
1011 |
45 |
5.5 |
1020 |
|
21 |
8.5 |
1030 |
46 |
6.0 |
1025 |
|
22 |
7.4 |
1014 |
47 |
5.5 |
1023 |
|
23 |
7.2 |
1030 |
48 |
7.6 |
1028 |
|
24 |
5.6 |
1016 |
49 |
8.6 |
1020 |
|
25 |
6.3 |
1020 |
50 |
6.3 |
1026 |
Table 1 – Particulate Count vs Filter Fan Speed, Number 3 Filter
Shown below is the resulting scatter diagram, Figure 4
What can we say about fan speed as a possible cause for variability in particulate levels? From this diagram, it is unclear what the precise nature of this relationship is. It appears as a general rule that as fan speed rises, particulate counts rise.
[ Back to "Cause Effect and Scatter Diagrams" ]
