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According to census records, the age distribution of the inhabitants of the United States in 1960 and in 1980 is as shown in the table below.
Age Group
1960
1980
5
20,321
16,348
5-9
18,692
16,700
10-14
16,773
18,242
15-19
13,219
21,168
20-24
10,801
21,319
25-29
10,869
19,521
30-34
11,949
17,561
35-39
12,481
13,965
40-44
11,600
11,669
45-49
10,879
11,090
50-54
9,606
11,710
55-59
8,430
11,615
60-64
7,142
10,088
From an appropriate statistical description of these data sets, comment on the indicated changes in the population in the two decades between 1960 and 1980.
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