2. Compare characteristics of standard response surface designs for four fac-

tors.

(a) Create a uniform precision central composite design, a Box-Behnken design, a small composite design, and a hybrid design in SAS ADX.

(b) Compare the variance dispersion graphs for each design, the number of levels and total number of runs.

(c) Choose one of the designs you have created, export it to a SAS data set and use it to print a randomized data collection for the design.