What is the function of a population pyramid?
A population pyramid is a way to visualize two variables: age and sex. They are used by demographers, who study populations. A population pyramid is a graph that shows the distribution of ages across a population divided down the center between male and female members of the population.
What does the shape of population pyramid indicate?
A broad base and sharply tapering sides (a true pyramid shape) reflects high fertility rates and high mortality rates in younger age groups. Irregularities in the profile of the population pyramid convey information about changes in the population or aberrations.
What are the 3 shapes of population pyramids and what do they indicate?
And while every population pyramid is unique, most can be categorized into three prototypical shapes: expansive (young and growing), constrictive (elderly and shrinking), and stationary (little or no population growth). Let’s take a deeper dive into the trends these three shapes reveal about a population and its needs.
How do you describe a pyramid graph?
A pyramid graph is a chart in the shape of a triangle or pyramid. These charts are best used when your data is organized in some kind of hierarchical way. The levels indicate some kind of progressive order, like: More “important” to least important.
What does a narrow base to the population pyramid indicate?
A narrow base means a smaller proportion of young people, suggesting a low birth rate. A wide middle, tall pyramid means an ageing population, suggesting that there is a long life expectancy .
Which of the 3 basic shapes of population pyramids does the US have?
The three different shapes of population pyramids are expansive, constructive and stationary.
How and why does the pyramid shape change?
How and why does the pyramid shape change? When a less developed country is given the birth rate of a more developed country the shape changes from being a steep triangle to being more house shaped. This happens because the more developed country has more stable rates.
What are the 4 stages of population pyramids?
The stages of demographic transition are – (i) high stationary stage; (ii) early expanding stage; (iii) late expanding stage; (iv) low stationary stage and (v) declining or negative growth rate stage. These stages are represented by dramatically different population pyramids (Fig. 4).
How does a pyramid diagram work?
A pyramid chart is typically in the form of an equilateral triangle. This triangle is divided into a number of horizontal sections of equal height. A topic is placed in each section of the pyramid chart. The width of each section shows the level of hierarchy among the topics.