SOCL 2001 : Exam 2 Notes
Document Summary
Demography: scientific study of human populations, examines size, composition, distribution, and the changes and causes of the three. Population: a group of people who share a geographic territory, vary in size from a small town to the planet, world population has grown rapidly since 1800. Life expectancy: average number of years that people who were born at the same time will live, in 2009, worldwide was 69, us is 78, below at least 25 other developed countries. Sex ratio: the proportion of males to females in a group, 100- equal numbers of males and females, 95- fewer males, 105- fewer females. Population pyramid: visual representation of age and sex structure of a population, allow demographers to predict future needs of a population. Zero population growth: many nation are experiencing zero population growth, each woman has no more than two children resulting in a stable population.
