Division 1 (1:30 Class time)
A regression analysis relating test scores (Y) to training hours (X) produced the
following fitted question: yˆ = 28 − 0.4x.
What is the fitted value of the response variable corresponding to x = 5?
(b) What is the residual corresponding to the data point with x = 8 and y = 28? Is the
point above or below the line?
If x increases 2 units, how does yˆ change?
(d) An additional test score is to be obtained for a new observation at x = 7. Would
the test score for the new observation necessarily be 22? Explain.