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Calculating population change…

Calculating population change…. What factors do you need to take into account when calculating population growth?. Population dynamics. Learning outcomes You should all be able to: Identify the different factors that affect a change in population size. Most of you should be able to:

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Calculating population change…

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  1. Calculating population change… What factors do you need to take into account when calculating population growth?

  2. Population dynamics Learning outcomes You should all be able to: Identify the different factors that affect a change in population size. Most of you should be able to: Calculate “crude birth rate, crude death rate, fertility, doubling time and natural increase rate”. Some of you might be able to: Explain different values of “crude birth rate, crude death rate, fertility, doubling time and natural increase rate” from given data.

  3. Measure of population change • Crude birth rate • Crude death rate • Fertility • Doubling rate • Natural increase rate

  4. Crude Birth Rate What is Crude Birth Rate? Total number of births Calculate the following CBR: USA, 2005 Births: 4,138,349 Total population: 295,895,897 CBR = ? X 1000 CBR = The number of live births per 1000 people in a population. It does not take into account the age and sex structure of the population. Total population 13.98 per thousand

  5. Crude Death Rate Total number of deaths • How do you think it is calculated? X 1000 CDR = Total population Calculate the following CDR: USA, 2005 Deaths: 2,448,017 Total population: 295,895,897 CDR = ? 8.27 per thousand

  6. Fertility Rate Total number of births Total Fertility Rate is the average number of children each woman has over a lifetime. Fertility Rate is the number of births per thousand women of child-bearing age. Sometimes used as a synonym for birth rate. However fertility rate focuses on the number of births per 1000 women and birth rate looks at the entire population. X 1000 Fertility rate = Number of women of child-bearing age

  7. Natural Increase Rate Crude Birth Rate – Crude Death Rate The difference between the number of live births and deaths occurring in a year. Measures the population change but does not include the effects of migration. How would you calculate this? NIR % = 10 What was the NIR for the USA in 2005? (13.98 – 8.27) = 0.57% 10

  8. Doubling Time 70 Doubling time (years) = The time in years that it takes a population to double. Natural Increase Rate If you have an NIR of 1% what will the doubling time be? What was the doubling time of the US in 2005? 70 / 0.57 = 122.8 years

  9. On the worksheet Fill in the blank spaces using the calculations that we have just seen.

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