Question

A 10-year study conducted by the American Heart Association provided data on how age, blood pressure, and smoking relate to the risk of strokes. Data from a portion of this study follow. Risk is interpreted as the probability (times 100) that a person will have a stroke over the next 10-year period. For the smoker variable, 1 indicates a smoker and 0 indicates a nonsmoker.

Risk	Age	Blood Pressure	Smoker
12	57	152	0
24	67	163	0
13	58	155	0
56	86	177	1
28	59	196	0
51	76	189	1
18	56	155	1
31	78	120	0
37	80	135	1
15	78	98	0
22	71	152	0
36	70	173	1
15	67	135	1
48	77	209	1
15	60	199	0
36	82	119	1
8	66	166	0
34	80	125	1
3	62	117	0
37	59	207	1

Using age, blood pressure, and whether a person is a smoker, develop an estimated regression equation that can be used to predict risk. Use x₁ for age, x₂ for blood pressure, and x₃ for whether a person is a smoker. (Round your constant term to one decimal place and coefficients to three decimal places.)

I got -31.1+.409x+.168x2+16.9x3 as the answer on excel sheet but it said it was wrong.

Answer 1

The correct output for this is:

Hence,

Regression equation will be:

y = -91.8 + 1.077 x1 + 0.252 x2 + 8.740 x3

answered by: anonymous