Russel-Research-Method-in-Anthropology

596 Chapter 20
TABLE 20.1
Number of Children Wanted (CW) by College Students in the United States and in Liberia
# CW Region Sex # CW Region Sex # CW Region Sex
1 1 USA M 29 0 USA F 57 12 WA M
2 3 USA M 30 0 USA F 58 12 WA M
3 3 USA M 31 0 USA F 59 8 WA M
4 3 USA M 32 0 USA F 60 6 WA M
5 3 USA M 33 1 USA F 61 4 WA M
6 3 USA M 34 1 USA F 62 4 WA M
7 2 USA M 35 2 USA F 63 2 WA M
8 2 USA M 36 2 USA F 64 3 WA M
9 2 USA M 37 2 USA F 65 3 WA M
10 2 USA M 38 2 USA F 66 4 WA M
11 2 USA M 39 2 USA F 67 4 WA M
12 2 USA M 40 2 USA F 68 4 WA M
13 1 USA M 41 2 USA F 69 4 WA M
14 6 USA M 42 2 USA F 70 3 WA F
15 1 USA M 43 2 USA F 71 3 WA F
16 1 USA M 44 6 WA M 72 3 WA F
17 4 USA M 45 4 WA M 73 3 WA F
18 0 USA M 46 4 WA M 74 7 WA F
19 5 USA F 47 4 WA M 75 2 WA F
20 4 USA F 48 5 WA M 76 4 WA F
21 4 USA F 49 5 WA M 77 6 WA F
22 4 USA F 50 5 WA M 78 4 WA F
23 3 USA F 51 5 WA M 79 4 WA F
24 2 USA F 52 5 WA M 80 4 WA F
25 3 USA F 53 7 WA M 81 4 WA F
26 0 USA F 54 12 WA M 82 4 WA F
27 2 USA F 55 6 WA M 83 4 WA F
28 0 USA F 56 6 WA M 84 4 WA F
SOURCE: Data Analysis with MYSTAT by H. R. Bernard and W. P. Handerwerker, 1995. McGraw-Hill. Reproduced
with permission of The McGraw-Hill Companies.
The parent population is the general population from which the two samples
were pulled. Our best guess at 2 is to pool the standard deviations from the
two samples:
s 2 (n 11)s 12 (n 2 1)s 2
2
n 1 n 2 2
Formula 20.2
which is very messy, but just a lot of arithmetic. For the data on the two groups
of students, the pooled variance is: