Births and Deaths Flashcards
What information can we get from a census?
Population Size, structure and characteristics.
Give two factors which can increase population size.
Births and migration
Give two factors which can decrease a population size
Death and migration
Define Crude Birth Rate.
The number of live births per 1000 people in the population.
Define General Fertility Rate
The number of liver births per 1000 females aged 15-44 in the population
How is Total Period fertility rate calculated?
This is the theoretical number of births per woman in her lifetime. The fertility rate is calculated for each of her fertile years and these are added to give a number of children she would theoretically have. 2 is needed for population to be maintained.
What is the difference between fertility and fecundity?
Fecundity is the physical ability to reproduce, it is reduced by hysterectomies and sterilisation.
Fertilisation is the realisation of this potential. It is increased by sexual activity, but decreases with use of contraception and abortions
Define Crude Death Rate
The number of deaths per 1000 people in the population
Define age specific death rate.
The number of deaths per 1000 people in that age group.
What is SMR? (standardised mortality ratio)
This is where the deaths in a population are compared to another population but the same age sex distribution is used. It removes confounding due to age and sex.
What three factors do we need data on to make a population estimate?
Births, Deaths and Migration
What is a population projection?
It is where an estimate is made for the future population based on assumptions.
What is the difference between random and systematic variation?
Random variation is due to chance, not everyone is the same.
Systematic variation is caused by the systems which were used to collect the data.
Define a Census.
The simultaneous recording of demographic data by the government at a particular time containing all the persons who live within that particular territory.
