DX10-02-1-Simple-Sample-FT Rev. Z:\Manual\DX10\Final DX10 tutorials\DX10-02-1-Simple-Sample-FT.docx1/27/2016
Design-Expert® Software Version 10 Feature Tour:
Simple Sample Data Analysis
Version 10 of Design-Expert (DX10) features a “simple sample design” that facilitates a straight-forward
analysis of raw data, making it easy to calculate the mean
and other statistics that characterize measurements.
To illustrate the simple sample tools of DX10, let’s
characterize the performance of a motor-shaft supplier. The
data, shown below, is a measure of the endplay:
61, 61, 57, 56, 60, 52, 62, 59, 62, 67, 55, 56, 52, 60, 59, 59,
60, 59, 49, 42, 55, 67, 53, 66, 60. The purchaser of this part
needs the mean, standard deviation, and 95% confidence
interval of this vital attribute in order to make an informed
decision on whether it meets manufacturing requirements.
From the Factorial tab select Simple Sample and, as shown
in the screen shot, enter the Response Name “Endplay” and Rows 25 for the number of observations.
Then click Continue. The program then presents a blank
data entry sheet—a “design layout.”
Either type in the above data now or open the file “Simple
Sample-Motor
Shaft.dxpx” that
provides it preentered. Now
proceed with the
analysis by going to
the R1: Endplay node
and pressing forward
to the ANOVA tab.
Design-Expert then
presents the needed
statistics as seen here.
Check out the graphs
under Diagnostics (run 20 bears watching as you will see by changing to the Externally Studentized scale
for the Resid vs Run chart) as well as the 95%-confidence-banded model graph copied out to the right.
Also, take a look at the tools under the Post Analysis node for Point Prediction, in particular the
tolerance interval, a very useful
statistic for a purchaser who needs
Simple Sample
to establish incoming
specifications.
Design-Expert® Software
Endplay
Design Points
95% CI Bands
70
Std # 20 Run # 20
Y = Endplay = 42
CI = (55.6418, 60.2782)
60
E n d p la y
This concludes our feature tour of
simple sample tools in DX10. Feel
free to explore other tools. If you
need more information at any
time, press shift + F1 for Tips,
Screen Tips off the main menu or
push the light bulb icon.
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