4, in the order obtained in overhead 3-33

1in the box ,"Number of Center Points"

highlight c1, c2, and c3

-

comparethemean Y for

X1↓LowvsX↑High
1

-

comparethemean Y for

X↓vsXH
2Low2↑igh

Low
(–1)

High
(+1)

X1

X2

1

-1

-1

2

-1

+1

3

+1

-1

4

+1

+1

X1

X2

(+1) High

22

#offactors or variables

#oflevels(High, Low)

1.

1independent variable(X1),twolevels:

_______________________
Low(X1)High

“Geometric
representation”

-

compare Y for X1↓Low, X↑High
1

2.

2independent variables

(X1,X2) ,eachhavingtwolevels:

23

X1

X2

X
3

1

-1

-1

-1

2

-1

-1

+1

3

-1

+1

-1

4

-1

+1

+1

5

+1

-1

-1

6

+1

-1

+1

7

+1

+1

-1

8

+1

+1

+1

–1

+1

X
1

X
2

+1

+1

X3