Statistical Design of Experiments
Statistical Design of Experiments
Statistical Design of Experiments
Statistical Design of Experiments
Modeling Example
Modeling Example
Minitab will print out a
Minitab will print out a
mathematical model
mathematical model
Consider the model for yield
Consider the model for yield
as follows:
as follows:
Yield = 60.67 + 0.079*temp + 4.83*pressure 
Yield = 60.67 + 0.079*temp + 4.83*pressure 
0.004*temp*pressure
0.004*temp*pressure
Use this model to predict values of
Use this model to predict values of
Temperature and Pressure that
Temperature and Pressure that
weren’t run, but are within
weren’t run, but are within
the
the
range of tested values (i.e.
range of tested values (i.e.
temperature between 20° & 40°)
temperature between 20° & 40°)
Yield @ 30° and 2 bar pressure =
Yield @ 30° and 2 bar pressure =
60.67 + 0.079*30 + 4.83*2 
60.67 + 0.079*30 + 4.83*2 

0.004*30*2 =
0.004*30*2 = 72.46
72.46