Population, urban systems and indicators
| English | 中文 | Pinyin |
|---|---|---|
| immigration/ˌɪmɪˈɡreɪʃn/ | 迁入 | qiān rù |
| indicator/ˈɪndɪkeɪtə/ | 指标 | zhǐ biāo |
What would explain this observation?
- A city can grow because people move into it even when births equal deaths. Population change has several flows.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Population change depends on births, deaths, immigration 迁入 and emigration. Urban systems exchange energy, materials and waste with a wider region. A sustainability indicator 指标 measures a specified feature rather than total wellbeing.
- immigration: Movement into a population; indicator: A measure of a specified condition.
Which contributes positively to population change?
Compare rates with a common denominator and interval. An average can hide unequal access to services. At HL, evaluate how economic incentives, legal responsibilities and ethical priorities change an urban management proposal.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Compare rates with a common denominator and interval. An average can hide unequal access to services. At HL, evaluate how economic incentives, legal responsibilities and ethical priorities change an urban management proposal.
- Use published demographic and city-service data with dates and definitions. Protect privacy when collecting local opinions. Compare the same geographical boundary rather than mixing an urban core with a whole metropolitan region.
Which two habits make the investigation or model in this case more defensible?
Use published demographic and city-service data with dates and definitions. Protect privacy when collecting local opinions. Compare the same geographical boundary rather than mixing an urban core with a whole metropolitan region.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a city has 10,000 people; births 150, deaths 100, immigration 300 and emigration 200 in one year. Change = 150-100+300-200 = 150. Growth percentage = 150/10,000×100 = 1.5%.
A population of 2,000 grows by 40 in a year. Find percentage growth. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A population of 2,000 grows by 40 in a year. Find percentage growth.
The result is 2 %. Known: a city has 10,000 people; births 150, deaths 100, immigration 300 and emigration 200 in one year. Change = 150-100+300-200 = 150. Growth percentage = 150/10,000×100 = 1.5%.
Check the conclusion and its limits
- A projected population is conditional on assumptions. Urban growth does not automatically mean improved health, income or environmental quality for every resident.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Population growth depends only on births and deaths. This claim is false: A projected population is conditional on assumptions. Urban growth does not automatically mean improved health, income or environmental quality for every resident.
Population, urban systems and indicators: Compare rates with a common denominator and interval. An average can hide unequal access to services. At HL, evaluate how economic incentives, legal responsibilities and ethical priorities change an urban management proposal.
Population growth depends only on births and deaths.
A projected population is conditional on assumptions. Urban growth does not automatically mean improved health, income or environmental quality for every resident.
Movement into a population: write the technical term.
immigration means Movement into a population.