Population Rates
Population, Rate, and Population Pyramids
Demography: the study of human populations
Emigration Rate: number of people per 1000 population in one year who emigrates
Compounding Population
Doubling Time: time it takes for a population to double at the current population growth rate (use the rule of 70 to find)
Rule of 70: Divide 70 by the population growth rate to estimate how many years it will take to double
Dependency Load: Portion of the population that is not in the work force
Population Pyramid: a series of horizontal bar graphs for each gender in a population, put back-to-back (or side-to-side)
Demography: the study of human populations
- Population growth = (number of people born – number of people dead) + (immigrants – emigrants)
- Birth Rate: relationship between number of births a year and the total population
- Death Rate: relationship between number of deaths a year and the total population
- Birth rate – death rate
- This tells us how quickly a country’s population will increase
Emigration Rate: number of people per 1000 population in one year who emigrates
- Net Migration Rate: combining the immigration and emigration rate
Compounding Population
Doubling Time: time it takes for a population to double at the current population growth rate (use the rule of 70 to find)
Rule of 70: Divide 70 by the population growth rate to estimate how many years it will take to double
- 70 / Population Growth Rate
- = 70 / 1.1
- = 64 years until the population will double at the current population growth rate of 1.1%
Dependency Load: Portion of the population that is not in the work force
- age that can be in the work force is considered between 16 to 64 years old
- dependency load references people ages 65 and above, and recently born to age 14
Population Pyramid: a series of horizontal bar graphs for each gender in a population, put back-to-back (or side-to-side)