1. 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. A portion of the data may be found under the tab...

1. 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. A portion of the data may be found under the tab Stroke. Risk is interpreted as the probability that the patient will have a stroke over the next 10-year period.

a. Develop an estimated regression equation for smokers and non-smokers that relates risk of a stroke to the person’s age, blood pressure, and whether the person is a smoker.

b. Is smoking a significant factor in the risk of a stroke? Explain. Use a = .05.

c. Interpret the correlation coefficient for age.

d. What is the probability of a stroke over the next 10 years for Michael Manns, a 68-year-old smoker who has blood pressure of 175?

Risk	Age	Pressure	Smoker
12	57	152	No
24	67	163	No
13	58	155	No
56	86	177	Yes
28	59	196	No
51	76	189	Yes
18	56	155	Yes
31	78	120	No
37	80	135	Yes
15	78	98	No
22	71	152	No
36	70	173	Yes
15	67	135	Yes
48	77	209	Yes
15	60	199	No
36	82	119	Yes
8	66	166	No
34	80	125	Yes
3	62	117	No
37	59	207	Yes

Stroke RiskAgePressureSmoker 1257152No 2467163No 1358155No 5686177Yes 2859196No 5176189Yes 1856155Yes 3178120No 3780135Yes 157898No 2271152No 3670173Yes 1567135Yes 4877209Yes 1560199No 3682119Yes 866166No 3480125Yes 362117No 3759207Yes Poverty YearPercent Christopher J. Zappe, Ph.D.: Percent of all individuals under the age of 18 living below the poverty level in the United States. 195927.3 196026.9 196125.6 196225.0 196323.1 196423.0 196521.0 196617.6 196716.6 196815.6 196914.0 197015.1 197115.3 197215.1 197314.4 197415.4 197517.1 197616.0 197716.2 197815.9 197916.4 198018.3 198120.0 198221.9 198322.3 198421.5 198520.7 198620.5 198720.3 198819.5 198919.6 199020.6 199121.8 199222.3 199322.7 199421.8 199520.8 199620.5 199719.9 199818.9 199916.9 200016.1 200116.3 200216.7 200317.6 200417.8 200517.6 200617.4 200718.0 200819.0 Airlines YearQuarter%OccupancyDiscount 116321 27534 37618 45826 215918 26240 38125 47630 316523 27028 37830 46935 415920 26135 38326 47130 516025 26637 38625 47430 Upper 95.0% 68.6350363298 0.8040490492 22.6412841912