{"id":70527,"date":"2019-05-17T06:23:45","date_gmt":"2019-05-17T13:23:45","guid":{"rendered":"https:\/\/www.questionpro.com\/blog\/?p=70527"},"modified":"2023-08-08T05:55:19","modified_gmt":"2023-08-08T05:55:19","slug":"population-of-interest","status":"publish","type":"post","link":"https:\/\/www.questionpro.com\/blog\/population-of-interest\/","title":{"rendered":"Population of interest &#8211; Definition, scope, characteristics, techniques, and advantages"},"content":{"rendered":"<h2><a id=\"What_is_population_of_interest?\" class=\"blankurl\" href=\"#\"><strong>What is population of interest?<\/strong><\/a><\/h2>\n<p><span style=\"font-weight: 400;\">A &#8220;population of interest&#8221; is defined as the population\/group from which a researcher tries to draw conclusions. It is a subset of the general population that the surveyor wants to know more about.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Many research studies require specific groups of interest to make decisions based on their findings. This group of interest is known as a<\/span><a href=\"https:\/\/www.questionpro.com\/blog\/sample\/\"><span style=\"font-weight: 400;\"> sample<\/span><\/a><span style=\"font-weight: 400;\">. Sampling is a method deployed to select survey respondents.<\/span><\/p>\n<p style=\"text-align: center;\"><em><strong>LEARN ABOUT:<\/strong><\/em>\u00a0<a href=\"https:\/\/www.questionpro.com\/blog\/sampling-frame\/\"><em>Sampling Frame<\/em><\/a><\/p>\n<p><span style=\"font-weight: 400;\">For example: If you are interested in the average time a person between the age of 30-35 takes to recover from a specific ailment after consuming a particular type of medication, the population of interest is all persons between 30-35 year-olds with that ailment using that medication.<\/span><\/p>\n<p style=\"text-align: center;\"><a class=\"square-cta secondary-lined-cta\" href=\"https:\/\/www.questionpro.com\/a\/showEntry.do?mode=audience&amp;sourceRef=blog-audience\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Select your respondents<\/strong><\/a><\/p>\n<h3><a id=\"How_broad_is_the_scope_of_population_of_interest?\" class=\"blankurl\" href=\"#\"><strong>How broad is the scope of population of interest?<\/strong><\/a><\/h3>\n<p><span style=\"font-weight: 400;\">The population of interest is not limited to the human population only. It is a group of aspects that have something in common. It can be objects, animals, measurements, etc. having many characteristics within a group.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example, a medical study examines the spread of a specific disease in street dogs in a city. Here, street dogs belonging to that city are the population of interest. This population of interest or sample represents the entire population you want to conclude.<\/span><\/p>\n<h3><a id=\"Choosing_an_accurate_sample_out_of_the_population_of_interest:\" class=\"blankurl\" href=\"#\"><strong>Choosing an accurate sample out of the population of interest:<\/strong><\/a><\/h3>\n<p><span style=\"font-weight: 400;\">Sampling is a powerful technique of collecting opinions from a wide range of people, chosen from a particular group, with the effort to know more about an entire group in general. Deciding upon a suitable sample from your population of interest depends on several key factors:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Firstly, decide on what population parameters you would like to estimate.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Don&#8217;t expect the estimates taken from a sample to be exact. Always assume a margin of error while making assumptions based on the results of a sample.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Know the cost of sampling the given population. Understanding this cost helps us determine how precise our estimates should be.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Know how variable the population you want to measure is. It is not necessary to assume that a large sample is required if the population of interest is substantial.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Take into account the response rate of your population. A response rate of 20% is considered &#8216;good&#8217; for an online research study.<\/span><\/li>\n<\/ul>\n<h3><a id=\"How_to_identify_the_population_of_interest?\" class=\"blankurl\" href=\"#\"><strong>How to identify the population of interest?<\/strong><\/a><\/h3>\n<p><span style=\"font-weight: 400;\">For any research\u00a0population to be practical, it is imperative to select the population of interest that is truly representative of the whole population.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Before you begin your research study, identify and agree upon the target population.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Choose and know your sample well in advance. This will go a long way in eliminating any feedback that will be deemed useless for your study.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">If your survey goal is to understand the effectiveness of a product or service, then the target population should be the customers who have used it or best fits who will use the product\/service.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It would be very costly and time-consuming to collect data from the whole population of your target market. By accurately sampling your population of interest, it is possible to build an actual picture of the target market using common trends from the results.<\/span><\/li>\n<\/ul>\n<h3><a id=\"Characteristics_of_sampling_in_the_population_of_interest\" class=\"blankurl\" href=\"#\"><strong>Characteristics of sampling in the population of interest<\/strong><\/a><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sampling renders a mechanism for<\/span><span style=\"font-weight: 400;\"> gathering data<\/span><span style=\"font-weight: 400;\"> without surveying the whole targeted population. Read more on <a href=\"https:\/\/www.questionpro.com\/blog\/survey-data-collection\/\">survey data collection<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The population of interest is the entire unit of people you consider for the study. A sample is a subset of this group that represents the population.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sampling reduces survey fatigue, as it is used to prevent surveyors from conducting too many surveys, thereby increasing<\/span><a href=\"https:\/\/www.questionpro.com\/blog\/good-survey-response-rate\/\"><span style=\"font-weight: 400;\"> response rates.<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It is also much cheaper and time-saving than\u00a0<\/span><span style=\"font-weight: 400;\">surveying<\/span><span style=\"font-weight: 400;\"> the entire bunch.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Tracking patterns of response rates for different groups will help determine how many respondents to select.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The study is not only limited to the selected part but applies to the whole targeted population.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong>LEARN ABOUT:<\/strong> <a href=\"https:\/\/www.questionpro.com\/blog\/survey-sampling\/\">Survey Sampling<\/a><\/p>\n<h3><a id=\"What_are_the_techniques_of_sampling_your_population_of_interest?\" class=\"blankurl\" href=\"#\"><strong>What are the techniques of sampling your population of interest?<\/strong><\/a><\/h3>\n<p><span style=\"font-weight: 400;\">Now that you understand you can&#8217;t survey the entire population of interest due to various factors, you must adopt one of the best-suited sample selection methodologies for your research study. There are two methodologies you can apply:<\/span><a href=\"https:\/\/www.questionpro.com\/blog\/probability-sampling\/\"><span style=\"font-weight: 400;\"> Probability sampling<\/span><\/a><span style=\"font-weight: 400;\"> and<\/span><a href=\"https:\/\/www.questionpro.com\/blog\/non-probability-sampling\/\"><span style=\"font-weight: 400;\"> Non-probability sampling<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><a id=\"Probability_sampling_to_determine_the_population_of_interest:\" class=\"blankurl\" href=\"#\"><strong>Probability sampling to determine the population of interest:<\/strong><\/a><\/h3>\n<p><span style=\"font-weight: 400;\">Probability sampling means selecting the sample based on the theory of probability. The sample includes everyone, with all having an equal chance of being selected. There is no bias whatsoever in this type of sample. Every person in the population has an opportunity to be a part of the research.<\/span><\/p>\n<h4><b>What are the four types of probability sampling?<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\"><b>Simple random sampling:<\/b> This method<span style=\"font-weight: 400;\"> is the simplest way of selecting a sample. Here, every member has an equal chance of being a part of the sample. The objects in this sample are chosen randomly, and every member has the same probability of being selected. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/simple-random-sampling\/\">simple random sampling<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Cluster sampling:<\/b> <span style=\"font-weight: 400;\">This<\/span><span style=\"font-weight: 400;\"> is a method where respondents are grouped into clusters. These clusters may be defined based on demographic parameters such as age, sex, location, etc. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/cluster-sampling\/\">cluster sampling<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Systematic sampling:<\/b><span style=\"font-weight: 400;\"> In<\/span><span style=\"font-weight: 400;\"> systematic sampling<\/span><span style=\"font-weight: 400;\">, the individuals are chosen at equal intervals from the population. A starting point is selected, and then respondents are picked at pre-defined sample intervals. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/systematic-sampling\/\">systematic sampling<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Stratified random sampling:<\/b> Stratified random sampling is a process of splitting the respondents into distinctive but pre-defined parameters. In this method, the respondents don&#8217;t overlap but collectively represent the whole population. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/stratified-random-sampling\/\">stratified random sampling<\/a>.<\/li>\n<\/ul>\n<h3><b>Non Probability sampling to determine the population of interest:<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The non-probability sampling method uses the researcher&#8217;s preference regarding selecting a sample. This method of sampling is derived mostly based on the researcher&#8217;s ability to access to this sample. Here the members of the population do not have an equal chance of being a part of the sample.<\/span><\/p>\n<h4><b>What are the four types of Non-probability sampling?<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Convenience sampling: <\/strong><span style=\"font-weight: 400;\">As the name suggests,<\/span><span style=\"font-weight: 400;\"> convenience sampling<\/span><span style=\"font-weight: 400;\"> stands for the convenience at which the researcher can reach the respondent. Researchers do not have the authority of selecting the samples and is purely done on the grounds of proximity and not representativeness. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/convenience-sampling\/\">convenience sampling<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><strong>Judgemental\/<a href=\"https:\/\/www.questionpro.com\/blog\/purposive-sampling\/\">Purposive Sampling<\/a>: <\/strong><span style=\"font-weight: 400;\">In<\/span><span style=\"font-weight: 400;\"> judgemental sampling<\/span><span style=\"font-weight: 400;\">, the researcher judges and develops his sample on the nature of the study and understanding of his target audience. Only people who fit the research criteria and end objectives are selected. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/judgmental-sampling\/\">judgemental sampling<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><strong>Snowball sampling: <\/strong><span style=\"font-weight: 400;\">As a snowball picks up pace, it gathers more snow around itself. Similarly, with<\/span><span style=\"font-weight: 400;\"> snowball sampling<\/span><span style=\"font-weight: 400;\">, the respondents are tasked to provide referrals or recruit samples for the study once they finish participation in the study. Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/snowball-sampling\/\">snowball sampling<\/a>.<\/span><\/li>\n<li style=\"font-weight: 400;\"><strong>Quota sampling:<\/strong> Quota sampling is a method of obtaining a sample where the researcher has the privilege to select an example based on their strata. In this method, two people cannot exist under two different conditions. <span style=\"font-weight: 400;\">Read more about <a href=\"https:\/\/www.questionpro.com\/blog\/quota-sampling\/\">quota sampling<\/a>.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong data-rich-text-format-boundary=\"true\">LEARN MORE:<\/strong> <a href=\"https:\/\/www.questionpro.com\/blog\/population-vs-sample\/\">Population vs Sample<\/a><\/p>\n<h2><b>What are the advantages of sampling in a population of interest?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In most cases, out of the total population of interest, insights can be only gathered from your pre-defined samples. Here are the top nine advantages:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Very accurate &#8211; low chances of <a href=\"https:\/\/www.questionpro.com\/blog\/sampling-error\/\">sampling errors<\/a> (if sampled well)<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Economically viable<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Highly reliable<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">High suitability ratio towards the different surveys<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">It takes less time compared to surveying the entire population<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Reduced resource deployment<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Intensive &amp; exhaustive data<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Apply properties to a larger population<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Ideal when the population of interest is enormous<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><a class=\"square-cta secondary-lined-cta\" href=\"https:\/\/www.questionpro.com\/a\/showEntry.do?mode=audience&amp;sourceRef=blog-audience\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Select your respondents<\/strong><\/a><\/p>\n<p><span style=\"font-weight: 400;\">With QuestionPro Audience, choose from over 22million, high-quality survey respondents, who are double opted in and mobile-ready to participate in research studies. Begin your research study with a strong research foundation.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is population of interest? A &#8220;population of interest&#8221; is defined as the population\/group from which a researcher tries to [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":93340,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[206],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Population of interest - Definition, scope, characteristics, techniques, and advantages | QuestionPro<\/title>\n<meta name=\"description\" content=\"Do you know who your population of interest is? 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