The systolic blood pressure dataset (in the third sheet of the spreadsheet linked above) contains the systolic blood pressure and age of 30 randomly selected patients in a medical facility.

What is the equation for the least square regression line where the independent or predictor variable is age and the dependent or response variable is systolic blood pressure?

y=0.9709x+98.715

Patient 10 is 56 years old and has a systolic blood pressure of 154 mm Hg. What is the residual?

Is the actual value above, below, or on the line?

What is the interpretation of the residual?

(using excel sheets)

row A Individual 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

row b Age 39 47 45 47 65 46 67 42 67 56 64 56 59 34 42 48 45 17 20 19 36 50 39 21 44 53 63 29 25 69

row c Systolic blood pressure 144 220 138 145 162 142 170 124 158 154 162 150 140 110 128 130 135 114 116 124 136 142 120 120 160 158 144 130 125 175