Biostatistics

REVIEW QUESTIONS AND EXERCISES 585
CDA Age Edyrs IADL ADS CDA Age Edyrs IADL ADS
2.21 68 18 28 52 3.63 75 18 28 32
2:30 102 12 26 18 7:07 94 8 24 80
1.73 67 12 27 80 6.39 76 18 28 41
6.03 66 14 28 54 0:08 84 18 27 75
0:02 75 18 26 67 1.07 79 17 27 21
7:65 91 13 21 101 5.31 78 16 28 18
4.17 74 15 28 90 0.30 79 12 28 38
Source: Data provided courtesy of Debra Jansen, Ph.D., R.N.
15. In the following table are the cardiac output (L/min) and oxygen consumption (V O2 ) values for a
sample of adults (A) and children (C), who participated in a study designed to investigate the
relationship among these variables. Measurements were taken both at rest and during exercise. Treat
cardiac output as the dependent variable and use dummy variable coding and analyze the data by
regression techniques. Explain the results. Plot the original data and the fitted regression equations.
Cardiac
Output (L/min)
V O2
(L/min)
Age
Group
Cardiac
Output (L/min)
V O2
(L/min)
Age Group
4.0 .21 A 4.0 .25 C
7.5 .91 C 6.1 .22 A
3.0 .22 C 6.2 .61 C
8.9 .60 A 4.9 .45 C
5.1 .59 C 14.0 1.55 A
5.8 .50 A 12.9 1.11 A
9.1 .99 A 11.3 1.45 A
3.5 .23 C 5.7 .50 C
7.2 .51 A 15.0 1.61 A
5.1 .48 C 7.1 .83 C
6.0 .74 C 8.0 .61 A
5.7 .70 C 8.1 .82 A
14.2 1.60 A 9.0 1.15 C
4.1 .30 C 6.1 .39 A
16. A simple random sample of normal subjects between the ages of 6 and 18 yielded the data on total
body potassium (mEq) and total body water (liters) shown in the following table. Let total potassium
be the dependent variable and use dummy variable coding to quantify the qualitative variable.
Analyze the data using regression techniques. Explain the results. Plot the original data and the fitted
regression equations.
Total Body
Potassium
Total Body
Water
Sex
Total Body
Potassium
Total Body
Water
Sex
795 13 M 950 12 F
1590 16 F 2400 26 M
1250 15 M 1600 24 F
1680 21 M 2400 30 M
(Continued )