measuring population

Life expectancy:  the average number of years to be lived by a group of people born in the same year

Why are men expected to live less?

-They take more risks than most women do

-There are more men than women that have very dangerous jobs such as a lumberjack or construction worker

-There are more men than women in the armed forces

Crude birth rate: the number of births per 1,000 of the population

Crude death rate: the number of deaths per 1,000 of the population

Rate of Natural Increase (RNI):

-Produced by subtracting the death rate from the birth rate

-This gives us the annual natural growth rate -in percentage form- for a country or region

Net migration rate: the difference between the number of persons entering and leaving a country during a year

-An excess of persons entering the country in net immigration (written in a positive number)

-An excess of persons leaving the country is net emigration (written in a negative number)