Russel-Research-Method-in-Anthropology

Sampling Theory 177
12
10
Number of Cases
8
6
4
2
0
100 200 300 400
a. Means for 15 samples of 5 from the
50 GDP values in Table 7.1.
12
10
Number of Cases
8
6
4
2
0
200 250 300 350 400
b. Means for 50 samples of 5 from the
50 GDP values in Table 7.1.
12
10
Number of Cases
8
6
4
2
0
250 260 270 280 290 300 310 320 330
c. Means for 30 samples of 30 from the
50 GDP values in Table 7.1.
Figure 7.6. Visualizing the central limit theorem: The distribution of sample means
approximates a normal distribution.