Population definition and meaning collins english dictionary. In addition, the consensus model stipulates that the psychiatricmental health focus crosses the lifespan. What is the difference between a sample and a population, and. Instead, a selected few participants who make up the sample are chosen to ensure that the sample is representative of the population. A research population is also known as a welldefined collection of individuals or objects known to have similar characteristics. Pdf how do we know if a species is heading towards extinction. Research population the focus group of a scientific query. However, a study population defined by propensity scores is difficult for other investi gators to. Population definition and examples biology dictionary. This paper provides an overview of population definitions for largescale comparative.
The target population refers to the groups of youth a program is designed to serve. Population pyramid definition, a graph showing the distribution of a population by sex, age, etc. All individuals of the appropriate sex in the population are considered to be equally available as potential mates. However, the term has no consistent definition and can be viewed as stigmatizing certain groups. A group of individuals or items that share one or more characteristics from which data can be gathered and analyzed. Population density for questions 6 and 7, circle the letter of the correct answer. Information and translations of population size in the most comprehensive dictionary definitions resource on the web. Target population refers to the entire group of individuals or objects to which researchers are interested in generalizing the conclusions. Here, we assume that the data populations follow the normal distribution. However, due to the large sizes of populations, researchers often cannot test every individual in the population because it is too expensive and time. Overpopulation, under population, optimum population.
Population size synonyms, population size pronunciation, population size translation, english dictionary definition of population size. The total number of inhabitants constituting a particular. Population definition is the whole number of people or inhabitants in a country or region. Population distribution and density are usually notated by how many people live per square mile or square kilometer. Demographics definition in the cambridge english dictionary.
Definition of urban terms demographia world urban areas the city there are two generic forms of the city, the urban area the physical form and the metropolitan area the functional or economic form. A research population is generally a large collection of individuals or objects that is the main focus of a scientific query. In ancient greece, this can be found in the writings of herodotus, thucidides, hippocrates, epicurus, protagoras, polus, plato and aristotle. Population studies the concept, meaning and definition.
The geographic boundaries of a population are easy to establish for some species but more difficult for others. Yet, despite a well defined population in principle, even survey analysts are faced with. Population and sample examples a sample can be thought of as a small subset of the entire population that is representative of the population population mean between two independent samples two data samples are independent if they come from unrelated populations and the samples does not affect each other. Demography from prefix demofrom ancient greek demos meaning the people, and graphy from grapho, ies writing, description or measurement is the statistical study of populations, especially human beings demographic analysis can cover whole societies or groups defined by criteria such as education, nationality, religion, and ethnicity. Association for community health improvement offers a definition of the term external icon as well as the goals and processes that hospitals should consider as they implement population health strategies. This is a handy primer to explain the differences between population health, population management, and other terms related to the triple aim. Defining and framing the population sage publications. Which piece of information is used along with population size to calculate population density. Define and give an example of a population answers. He importance of identifying and defining the field of population educa tion became especially evident during and after the world population conference in.
An increase in the population of any species exceeding the carrying capacity of an ecological niche is referred to as overpopulation. Population definition of population by merriamwebster. In a theoretical framework, the term population is defined very precisely, as a set of individuals constituting a mating pool. Population biology is the study of population characteristics and the factors that affect their size and distribution. Why population aging matters national institute on aging. It is for the benefit of the population that researches are done.
The global population has grown from 1 billion in 1800 to 7. And, if this is the case, then the results from the sample can be inferred to the population, which is exactly the purpose of inferential statisticsusing information on a smaller group of participants to infer to the group of all participants. A sample is a subset of a population selected to participate in the study, it is a fraction of the whole, selected to participate in the research project brink 1996. In this survey, a subset of 55 women was selected out of the entire population of. Population refers to a group of individuals, in contrast to the individuals themselves, organized into many different units of analysis, depending on the research or policy purpose. Competencies specific to these newly defined population foci did not exist. Groups of humans rarely, if ever, fit this definition of a population. The first quartile designated q 1 is the lower and cuts off the lowest 25% of data the 25th percentile. Distribution refers to the fact that the area is inhabited. In statistics the term population has a slightly different meaning from the one. An increase in the number of people that reside in a country, state, county, or city. This work may not be reproduced or distributed in any form or by any means without express. In this survey, a subset of 55 women was selected out of the entire population of women who requested tops in the gert sibande district. Population structure can be used to categorize populations into many subsections and demonstrate population demographics on a local, regional or national scale.
The term overpopulation means too great a population for a given region to support. Population health is a relatively new term, with no agreement about whether it refers to a concept of health or a field of study of health determinants. Population meaning in the cambridge english dictionary. Businesses and governmental bodies use this information to make determinations about investing in. The definition of the relevant population and the collection of. The first generic form of the city is the physical expanse, or area of continuously builtup urbanization. Two types of population in research target population. Search for poems containing the term population size. To remain focused and deliver effective services, a program must define the population at which its services are aimed.
For example, plants or animals occupying islands have a geographic range defined by the perimeter of the island. Population pyramid definition of population pyramid at. Population growth is the increase in the number of individuals in a population. It is expected to keep growing, and estimates have put the total population at 8. The lecture notes on population and development provide information on demographic concepts, current trends of population growth, patterns and. For the first time in history, and probably for the rest of human history, people age 65 and over will outnumber children under age 5. The term at risk is used frequently to describe children and youth and has a strong intuitive meaning. Pdf introduction to population demographics researchgate. A ztest is a statistical test used to determine whether two population means are different when the variances are known and the sample size is. An example would be smallmouth bass in a pond although there are other smallmouth. This means that they can regularly exchange gametes to produce normallyfertile offspring, and such a breeding group is also known therefore as a gamodeme.
How to define the population of interest in operational terms. The positive side of this confusion is that program providers have some leeway in how they define at risk for. In population genetics and population ecology, population size is the number of individual organisms in a population. Lane and wileman 1974 define popu lation education as the study of human population and how it. There is debate, sometimes heated, about whether population health and public health are identical or different.
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. To determine whether there has been population growth, the following formula is used. In order for a program to remain focused and to deliver effective services, it must clearly define its target population and establish a referral mechanism that will ensure it receives the appropriate cases. The population of a country or area is all the people who live in it. Population explosion refers to the rapid and dramatic rise in world population that has occurred over the last few hundred years.
The population parameters are presented in table 91, along with the simple data array from which they were derived. Population structure is the composition of a given population, which is broken down into categories such as age and gender. Between 1959 and 2000, the worlds population increased from 2. This glossary contains terminology relating to population and demography. Population density definition of population density by. The aim of this introductory chapter is to recall the importance and the limits of the genetic definition. Population education is the study of human population ion relation to this environment with a view to improve the quality of life without adversely affecting the environment. A population is a selfcontained group of animals from a single species that interbreed only among the group. Examples of wildlife population dynamics, analysed to study determinants of population growth rate, using one or more. Population definition, the total number of persons inhabiting a country, city, or any district or area. Population definitions for comparative surveys in education acer. Concepts, definitions and data sources for the study of.
Population education in an exploration of knowledge and attitude about population, the family and sex. A mendelian population, defined as a group of individuals. Discussions of population health involve many terms, such as outcomes, disparities, determinants, and risk factors, which may be. Population density definition is the number of people living in each unit of area such as a square mile. Some authors distinguish absolute overpopulation where the absolute limit of production has been attained but standards of living remain low from. The group of people to whom we want our research results to apply study population.
Population size definition of population size by the. A mathematical term for the number of things or events happening in a. Dec 06, 2012 because population is such a fundamental term for so many sciences that analyze population datafor example, epidemiology, demography, sociology, ecology, and population biology and population genetics, not to mention statistics and biostatistics see, e. 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. Demography is made up of two word demos and graphy. Samples and populations uw computer sciences user pages. Commonly used statistical terms 147 measures of variability interquartile range iqr. The characteristics which are studied include the migratory patterns, the population density, the demographics the birth and death rates, sex ratio and age distribution, the population genetics, the life history traits and. Population size definition of population size by the free. A sample is a subset of the individuals in a population. Every descriptive measure value shown there is a parameter, as it is computed from information obtained from the entire population. The members of the study population from whom we collect our data target population. Population definition of population by medical dictionary. Population genetics ecology in population genetics a sexual population is a set of organisms in which any pair of members can breed together.
The target population usually has varying characteristics and it is also known as the theoretical population. All of the above approaches define the study population in terms of the. Although the term population health combines the concepts of both population and health, each term also has its own important meaning. Population density is the term that refers to how many people are in an area. Global human population growth amounts to around 83 million annually, or 1. In statistics, population may refer to people, objects, events, hospital visits, measurements, etc. The people who meet our operational definition of the target population research sample.
The term demography refers to the overall study of population. Population is the entire pool from which a statistical sample is drawn. A measure of statistical dispersion being equal to the difference between the third and first quartiles. Population definition and examples biology online dictionary.
The first quartile designated q 1 is the lower and cuts off the lowest 25% of. All individuals or objects within a certain population usually have a common, binding characteristic or trait. Consideration should be given to starting with a narrowly defined target population and, if necessary, expanding later. Before drawing a sample the investigator should define the population from. What is the difference between a sample and a population. There are many types of samples, including a random sample, a. Definition of youth perhaps changes with circumstances, especially with the changes in demographic, financial, economic and sociocultural settings. Usually, the description of the population and the common binding characteristic of its members are the same. Population definition of population by the free dictionary. Population distribution is a term that refers to where people live. Environmental events are one of the factors causing a population bottleneck. Population bottleneck is a reduction in the size of population for a short period of time. A population is a subset of individuals of one species that occupies a particular geographic area and, in sexually reproducing species, interbreeds. According to united nations projections, the world population will.
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