The regression model 200 5x1 2x2 has been fitted to a set of data If x2 10, what will be the effect on if x1 increases by 1 unit Will your answer change if x2 20 Given the preceding, comment on whether interaction appears to exist between x1 and x2

Question: The regression model = 200 + 5x1 2x2 has been fitted to a set of data. If x2 = 10, what will be

The regression model ŷ = 200 + 5x1 – 2x2 has been fitted to a set of data. If x2 = 10, what will be the effect on ŷ if x1 increases by 1 unit? Will your answer change if x2 = 20? Given the preceding, comment on whether interaction appears to exist between x1 and x2.

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