Hi All I'v problem with myhomework

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You will recall that there was a class DoE a couple of weeks ago. These provided
quite unsatisfactory results in that holding the funnel created some unexpected
interaction. In addition it has now been pointed that it is quite unethical to include a
“Gender” factor is such an experiment. Consequently the whole experiment has had
to be repeated with the results give on the DoE worksheet.
Your task is:
i. Conduct a thorough re-analysis of the data, with whatever tools have been
provided. Comment on the results.
ii. You will also recall that some extra runs were done (underneath extra runs in
the worksheet) but were never analysed. Use the results from (i) to predict
what the outcomes might have been and compare them with the actual results.
Comment on your observations.
The Data are:
Trial Holding Diameter Height Angle time
1 Yes L 25 20 1.1
2 Yes S 25 70 5.7
3 No S 10 20 6.1
4 No S 25 20 2.3
5 Yes L2570 7
6 NoL10203.9
7 YesL25201.9

32

extra runs
33 No L 10458.2
34 NoS10457.2
35 YesL10457.1
36 YesS10456.8

Hello, welcome to The Cove! :bigwave:

I didn't attend your class, so it's very difficult to understand your data's meaning. I would need to have a description of the experiment: the circumstances, tool setups, methods and techniques, what was called out to be done, what occured (was it different from the callout?), and point by point how the data was arrived at: did the person hold the funnel tilted to the left for some data points, what does "yes" mean, and so on.

This looks like a 2 level experiment with 4 factors (Holding Diameter Height Angle) and 1 response (time).

The design is rather odd, though. A standard design would typically have 2,4,8,16... trials, but this has 7. A typical design would also be close to balanced, btu this is oddly unbalanced (the height is "10" twice, but "25" 5 times; the angle is "70" twice, but "20" 5 times).

Even so, you should be able to analyze the experiment. Minitab can handle such designs with a little work, but you could also do the basics "by hand".


Hope that gives a few hints. I woould hate to do too much of your homework for you :)


Tim F

Thankssssssssssssssssss
A standard design are 32 trials but I did write only 7 trials. i need How i can find : (1),A,B,AB,C ...

The data are :
Trial-Holding-Diameter-Height-Angle-time
1-Yes-L-25-20-1.1
2-Yes-S-25-70-5.7
3-No-S-10-20-6.1
4-No-S-25-20-2.3
5-Yes-L-25-70-7
6-No-L-10-20-3.9
7-Yes-L-25-20-1.9
8-Yes-S-25-20-1.6
9-No-L-25-70-7.1
10-No-L-25-70-7.8
11-No-S-25-70-4
12-Yes-S-10-20-4.7
13-No-S-10-70-6.9
14-No-L-10-70-8
15-No-S-25-70-4.7
16-No-L-25-20-1.2
17-No-S-25-20-2.1
18-Yes-L-10-70-5.9
19-Yes-S-10-70-7.6
20-No-S-10-20-7.5
21-Yes-S-10-20-2.5
22-Yes-S-25-70-7.6
23-Yes-L-10-20-4.3
24-No-L-10-20-4
25-Yes-S-25-20-2.1
26-No-S-10-70-6.3
27-Yes-L-25-70-7.3
28-Yes-L-10-70-7.3
29-Yes-L-10-20-5.4
30-No-L-25-20-3.5
31-Yes-S-10-70-5.8
32-No-L-10-70-6.6
extra runs
33-No-L-10-45-8.2
34-No-S-10-45-7.2
35-Yes-L-10-45-7.1
36-Yes-S-10-45-6.8

Thankssssssssssssssssss
A standard design are 32 trials but I did write only 7 trials. i need How i can find : (1),A,B,AB,C ..........


What have you accomplished so far? Show us some of your results for analyis and feedback by our resident DOE experts....

Stijloor.

Thankssssssssssssssssss
A standard design are 32 trials but I did write only 7 trials. i need How i can find : (1),A,B,AB,C ...

The data are :....

What is unclear to me is what level is your DOE course? Depending on the level of the course, the model development might require the reduced model or a full model. Let me know which it is.

You can use a standard ANOVA method, where the results look like this:

Source Nparm DF Sum of Squares F Ratio Prob > F
Holding 1 1 0.551250 0.4444 0.5122
Diameter 1 1 0.720000 0.5805 0.4546
Height 1 1 20.801250 16.7712 0.0005
Angle 1 1 82.561250 66.5657 <.0001
Holding*Diameter 1 1 0.005000 0.0040 0.9500
Holding*Height 1 1 1.711250 1.3797 0.2533
Holding*Angle 1 1 3.001250 2.4198 0.1348
Diameter*Height 1 1 2.420000 1.9511 0.1771
Diameter*Angle 1 1 4.500000 3.6282 0.0706
Height*Angle 1 1 11.761250 9.4826 0.0057

Source N DF Sum of F Ratio Prob > F
Parm Squares
Holding 1 1 0.551250 0.4444 0.5122
Diameter 1 1 0.720000 0.5805 0.4546
Height 1 1 20.801250 16.7712 0.0005
Angle 1 1 82.561250 66.5657 <.0001
Holding*Diameter 1 1 0.005000 0.0040 0.9500
Holding*Height 1 1 1.711250 1.3797 0.2533
Holding*Angle 1 1 3.001250 2.4198 0.1348
Diameter*Height 1 1 2.420000 1.9511 0.1771
Diameter*Angle 1 1 4.500000 3.6282 0.0706
Height*Angle 1 1 11.761250 9.4826 0.0057