43 Suppose you fit the interaction model

to n = 32 data points and obtain the following results:
SSyy = 479 SSE = 21 b n 3 = 10 sb n 3 = 4

a. Find R2 and interpret its value.

b. Is the model adequate for predicting y ? Test at a = .05.

c. Use a graph to explain the contribution of the x1 x2 term to the model.

d. Is there evidence that x1 and x2 interact? Test at a = .05.

Transcribed Image Text:

y=Bd+ Bx1 + B2x2 + B3x1x2 + E