Final answer:
The examination of Figure A6 and Table A4 reveals the changing U.S. population structure from 1970 to 2000 and projected to 2030, showing demographic shifts and informing potential resource allocation and policy-making.
Step-by-step explanation:
When analyzing Figure A6 and Table A4 concerning the distribution of the U.S. population by age groups for the years 1970, 2000, and a projection for 2030, we are examining the demographic shifts in the United States over time. Table A4 provides the numerical data, categorizing the total population into three age brackets: birth to 18 years, 19 to 64 years, and 65 years and above. The first number in columns 2-4 indicates the actual count of individuals in each category, while the numbers in parentheses represent the respective percentages of the total population. Following this, Figure A6 uses pie charts to visually depict these population segments, offering an immediate graphic representation of the changes in population structure over these three benchmark years.
The data is essential for understanding demographic trends, such as the aging of the population and the potential impact on healthcare, social services, and labor markets. For instance, an increase in the percentage of the elderly population can signal a greater need for healthcare services tailored to that age group and adjustments to retirement and pension systems. Educational demands and childcare services are influenced by the proportion of the youth population. These findings enable policymakers and businesses to plan and allocate resources effectively.