Population Studies.( Late because I had no computer access) Defs

   First ill give defintions.
1.Life Expectancy-Noun, The probable number of years remaining in the life of an individual or class of persons determined statistically affected by factors such as heredity, physical condition, nutrition and occupation.
http://dictionary.reference.com/browse/life+expectancy?fromAsk=true&o=100074


2.Crude Birthrate-Crude Birth Rate is the Nativity or childbirths per 1000 people per year.
http://en.wikipedia.org/wiki/Birth_rate

3.Crude Death Rate- The number of deaths per 1000 people every year.
http://en.wikipedia.org/wiki/Mortality_rate

4.RNI- RNI is the Crude Birth Rate minus the Crude Death Rate.
http://en.wikipedia.org/wiki/Rate_of_natural_increase

5.TFR-  The number of children born to  a woman over her lifetime.
http://en.wikipedia.org/wiki/Total_fertility_rate

6.Net Migration Rate- The difference between immigrants and emigrants in a period of time per 1000 people.
http://en.wikipedia.org/wiki/Net_migration_rate

7.Population Pyramid- A graph that shows the distribution of different age groups in human population.
http://en.wikipedia.org/wiki/Population_pyramid