The following data were used in a regression study.

observation xi yi

1 2 4

2 3 5

3 4 4

4 5 6

5 7 4

6 7 6

7 7 9

8 8 5

9 9 11

a. develope an estimated regression equation for these data.

b. construct a plot of the residuals. do the assumptions about the error term seem to be satisfied?

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