This first part of the volume deals with the composition of the populations by presenting the cases of three latin american countries either at the national or at the local level. Population density definition is the number of people living in each unit of area such as a square mile. Population growth caused an exponential increase in the alternation of the land utilization patterns to supplements economic needs in the form of agricultural pr oducts, fuel. The differences for individual countries, however, are some. This report is the fourth in the series world population ageing. Past, current and projected future population growth is outlined.
In a personal interview the director of the population education project in sri lanka a country in the asian region, expressed concern about this clause in the asian re gional unesco definition of population edu cation. City proper the population living within the administrative boundaries. Issn 10205195 business united nations population fund. Pdf how do we know if a species is heading towards extinction. The definition of the relevant population and the collection of. Population structure can be used to categorize populations into many subsections and demonstrate population demographics on a local, regional or national scale. Population division also organizes expert group meetings on various aspects of population ageing.
Information and translations of population projection in the most comprehensive dictionary definitions resource on the web. Regional groups of interconnected populations are called metapopulations. An essay on the principle of population an essay on the principle of population, as it affects the future improvement of society with remarks on the speculations of mr. Population definition, the total number of persons inhabiting a country, city, or any district or area. Pdf introduction to population demographics researchgate. As it is well illustrated by these examples, the concept of population has several meanings. In probability theory, a probability density function pdf, or density of a continuous random variable, is a function whose value at any given sample or point in the sample space the set of possible values taken by the random variable can be interpreted as providing a relative likelihood that the value of the random variable would equal that sample. Rural development in general is used to denote the actions and initiatives taken to improve the standard of living in nonurban neighborhoods, countryside, and remote villages. A manual for selecting sampling techniques in research. Population definition and meaning collins english dictionary. In this study the population was south african women of all races, age groups, educational status, socioeconomic status and residential areas, who. Population composition describes the statistical makeup of a group of people. This broader notion of health recognizes the range of social, economic and physical environmental factors that.
It is a set of individuals that share a characteristic or a set of these. The increase in the proportion of urban population over time, calculated as the rate of growth of the urban population minus that of the total population. Commonly this may be calculated for a county, city, country, another territory, or the entire world the worlds population is 7 billion, 4 and earths total area including land and water is. In comparison, the black alone population grew by 12 percent from 34. In statistics, a population is the entire pool from which a statistical sample is drawn. Population data definition population is the most fundamental aspect of our existence is defined as a set of individuals that share a characteristic or a set of these. Inthe countries in the midst of demographic transit ion and with. Learn all about population data definition, classification, estimation and importance. Pollution is the introduction of contaminants into the natural environment that cause adverse change. Population definition of population by the free dictionary.
In a number of towns the population may be less than 3 000 since these areas had. For humans, population density is the number of people per unit of area usually per square kilometer or mile which may include or exclude cultivated or potentially productive area. The lecture notes on population and development provide information on demographic concepts, current trends of population growth, patterns and. Many factors determine population health, which is shaped by the social determinants of health such as poverty, education and housing. The population of a country or area is all the people who live in it. Population meaning in the cambridge english dictionary. Pollutants, the components of pollution, can be either foreign substancesenergies or naturally occurring contaminants. The reliability and validity of the research instrument are addressed. Positive rates of urbanization result when the urban population grows at a faster rate than the total population. This means that they can regularly exchange gametes to produce normallyfertile offspring, and such a breeding group is also known therefore as a gamodeme. Depopulation definition, to remove or reduce the population of, as by destruction or expulsion.
The population health approach recognizes that health is a capacity or resource rather than a state, a definition which corresponds more to the notion of being able to pursue ones goals, to acquire skills and education, and to grow. Population definition is the whole number of people or inhabitants in a country or region. Barring a calamitous pandemic, a further increase in the worlds population from 7 to between 8. The population of the city opposes the addition of fluorides. A population distribution is a statement of the frequency with which the units of analysis or cases that together make up a population are observed or are expected to be observed in the various classes or categories that make up a variable.
The worlds population continues to increase, but growth rates vary greatly across regions the worlds population is projected to grow from 7. Cities and urbantype localities, officially designated as such, usually according to the criteria of number of inhabitants and predominance of agricultural, or number of nonagricultural workers and their families. Other articles where population movement is discussed. The 2019 revision of the world population prospects is the twentysixth edition of the united nations population estimates and projections. A population can thus be said to be an aggregate observation of subjects grouped together by a common feature. A population is all the individuals or units of interest. Urban population refers to persons who live in cities and towns, i. A manual for selecting sampling techniques in research 4 preface the manual for sampling techniques used in social sciences is an effort to describe various types of sampling methodologies that are used in researches of social sciences in an easy and understandable way. It is frequently applied to living organisms, most of the time to humans. Overpopulation definition of overpopulation by merriam. Princetonstanford working papers in classics population and demography version 1. Definitions urban area the definition of urban varies from country to country, and, with periodic reclassification, can also vary within one country over time, making direct comparisons difficult. Depopulation definition of depopulation by the free.
These metapopulations are, in turn, connected to one another. Its an important tool for researchers, that help us understand the ways that populations are changing, and what that. An urban area can be defined by one or more of the following. This also implies that all members belong to the same species. Comprehensive tables mortality databaselambda university of wisconsinmadison, the international data base u. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Rural areas are large and isolated areas of an open country with low population density.
Definition of population projection in the definitions. A population census can be defined as process of collection, reception, assessment, analysis, publication and distribution of demographic, economic and social data, which relate, at a given moment in time, to all the residents of a country or of a welldefined partial geographic area. Under the standards, the county or counties in which at least 50 percent of the population resides within urban areas of 10,000 or more population, or that contain at least 5,000 people residing within a single urban area of 10,000 or more population, is identified as a central county counties. Its an important tool for researchers, that help us understand the ways. Population definition of population by merriamwebster. Despite the variety of definitions used, the population in rural areas in the eu has hovered around 29% for the past decade. The sample size is a term used in market research for defining the number of subjects included in a sample size. Population structure can be used to categorize populations into many subsections and demonstrate population demographics on a.
Information and translations of population size in the most comprehensive dictionary definitions resource on the web. Population density definition of population density by. A population may refer to an entire group of people, objects, events, hospital visits, or measurements. It is based on knowledge of the past trends, and, for the future, on assumptions made for three components.
The definition of population units for any given research project will depend on the nature of the topic and the purposes of the study. A group of individuals or items that share one or more characteristics from which data can be gathered and analyzed. Census bureau, the global burden of disease project ihme, university of washington, the developing countries mortality databasedcmd zhejiang university, ipumsinternational, and. Population definitions for comparative surveys in education acer. Definition demography can be defined as the study of human. Between 2000 and 2010, the hispanic population grew by 43 percent, which was four times the growth in the total population at 10 percent. Defining and framing the population sage publications. Population is the most fundamental aspect of our existence. Thus, ageing is determined not only by the pace of growth of the older population. A population projection gives a picture of what the future size and structure of the population by sex and age might look like. Population structure is the composition of a given population, which is broken down into categories such as age and gender. The three types of population pyramids are expansive, constrictive, and stationary. Pollution is often classed as point source or nonpoint source.
Implications of decisions surrounding population definition. The aim of this introductory chapter is to recall the importance and the limits of the genetic definition. Population growth definition of population growth by the. In statistics, population may refer to people, objects, events, hospital visits, measurements, etc. By sample size, we understand a group of subjects that are selected from the general population and is considered a representative of the real population for that specific study. Chapter 3 research design, research method and population 3. An increase in the population of any species exceeding the carrying capacity of an ecological niche is referred to as overpopulation. Population bottleneck is a reduction in the size of population for a short period of time. A population is mainly defined by geography, like all humans on earth, all people in california or all people in the united states. Overpopulation definition is the condition of having a population so dense as to cause environmental deterioration, an impaired quality of life, or a population crash. This paper provides a general overview of grecoroman population history.
Population genetics ecology in population genetics a sexual population is a set of organisms in which any pair of members can breed together. Definition, growth, growth models and other details. We have been concerned about unbridled human population growth and problems created by it in our country and it is therefore natural for us to be curious if different animal populations in nature behave the same way or show some restraints on growth. A population may refer to an entire group of people, objects. Population pyramids are graphical tools that are used to show the age and sex characteristics of a population.
The latter involves enumerating people at their place of usual residence. Population is the entire pool from which a statistical sample is drawn. Population census definitions, types, advantages and. Environmental events are one of the factors causing a population bottleneck. All elements, individuals, or units that meet the selection criteria for a group to be studied, and from which a representative sample is taken for detailed examination. For example, if we want to predict how the population. Population definition and examples biology online dictionary.
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