{"id":31237,"date":"2021-09-21T14:35:20","date_gmt":"2021-09-21T14:35:20","guid":{"rendered":"https:\/\/analystprep.com\/cfa-level-1-exam\/?p=31237"},"modified":"2026-04-20T09:34:40","modified_gmt":"2026-04-20T09:34:40","slug":"probability-and-non-probability-samples","status":"publish","type":"post","link":"https:\/\/analystprep.com\/cfa-level-1-exam\/quantitative-methods\/probability-and-non-probability-samples\/","title":{"rendered":"Probability and Non-Probability Sampling"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"VideoObject\",\n  \"name\": \"Sampling and Estimation (2025 Level I CFA\u00ae Exam \u2013 Quantitative Methods \u2013 Module 5)\",\n  \"description\": \"Dive into the world of probability distributions in this detailed module for the Level I CFA Program. Learn how to define and distinguish between discrete and continuous random variables, calculate probabilities, and interpret the normal, t-, chi-squared, and F-distributions. Explore critical concepts such as the properties of the normal distribution, standardization of variables, and the Monte Carlo simulation for complex financial modeling. Ideal for CFA candidates mastering quantitative methods.\",\n  \"uploadDate\": \"2021-11-21T00:00:00+00:00\",\n  \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/QDmc4Pa92bs\/maxresdefault.jpg\",\n  \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=QDmc4Pa92bs\",\n  \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/QDmc4Pa92bs\",\n  \"duration\": \"PT37M40S\"\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"QAPage\",\n  \"mainEntity\": {\n    \"@type\": \"Question\",\n    \"name\": \"Which sampling method is used when a researcher selects participants based on ease of access?\",\n    \"text\": \"A junior analyst wishes to study the spending patterns of employed investment professionals. To ease his data collection process, he selects only investment professionals in his firm. Which of the following is the most likely sampling method the analyst used?\\n\\nA. Cluster sampling.\\n\\nB. Convenience sampling.\\n\\nC. Judgmental sampling.\",\n    \"answerCount\": 1,\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"The correct answer is B.\\n\\nConvenience sampling involves selecting elements of a population based on how easily they can be accessed. In this case, the analyst chose professionals within his own firm because they were readily available.\\n\\nOption A is incorrect because cluster sampling is a probability sampling method involving random selection of groups.\\n\\nOption C is incorrect because judgmental sampling involves selecting participants based on the researcher\u2019s expertise or judgment, not convenience.\"\n    }\n  }\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"ImageObject\",\n  \"url\": \"https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling.jpg\",\n  \"contentUrl\": \"https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling.jpg\",\n  \"caption\": \"Probability and Non-Probability Sampling\",\n  \"width\": 1590,\n  \"height\": 1596,\n  \"copyrightNotice\": \"\u00a9 2024 AnalystPrep\",\n  \"acquireLicensePage\": \"https:\/\/analystprep.com\/license-info\",\n  \"creditText\": \"AnalystPrep Design Team\",\n  \"creator\": {\n    \"@type\": \"Organization\",\n    \"name\": \"AnalystPrep\"\n  }\n}\n<\/script>\n\n\n\n<p><iframe loading=\"lazy\" src=\"\/\/www.youtube.com\/embed\/QDmc4Pa92bs\" width=\"611\" height=\"343\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>A population is the total number of elements in a group while a sample is a portion of the population. Sample statistics\u2014quantities such as sample mean that describe sample data\u2014generalize the information about the population parameter. As such, we draw samples from a particular population mainly for two reasons. To begin with, when a population is large, it is expensive to study each member of the population. Besides, studying each member of a large population is time-consuming.<\/p>\n<p>The following are two types of sampling methods: Probability sampling and non-probability sampling.<\/p>\n<h2><strong>Probability Sampling<\/strong><\/h2>\n<p>In probability sampling, every member of the population has an equal chance of being selected. Probability sampling techniques include <strong>simple random sampling<\/strong>, <strong>stratified random sampling,<\/strong> <strong>cluster sampling<\/strong>, and <strong>systematic sampling.&nbsp;<\/strong>These techniques will be discussed further in the next reading objective.<\/p>\n<div style=\"background-color:#f5f7fa; padding:20px; text-align:center; margin:30px 0; border-radius:8px;\">\n  <div style=\"max-width:620px; margin:0 auto;\">\n    <a href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener noreferrer\"\n       style=\"display:flex; align-items:center; justify-content:center; width:100%; padding:10px 20px; border:2px solid #1a73e8; border-radius:999px; text-decoration:none; color:#1a73e8; font-size:15px; font-weight:600; line-height:1.4;\">\n      Practice sampling methods with our Free Trial\n    <\/a>\n  <\/div>\n<\/div>\n<h2><strong>Non-Probability Sampling<\/strong><\/h2>\n<p>In non-probability sampling, samples are selected on the basis of judgment or the convenience of accessing data. As such, non-probability sampling largely depends on a researcher&#8217;s sample selection skills. There are two types of non-probability sampling methods:<\/p>\n<ol style=\"list-style-type: lower-roman;\">\n<li><strong>Judgmental sampling<\/strong>: This type of sampling involves handpicking elements from a sample based on a researcher&#8217;s knowledge and expertise. It is important to point out that in this sampling method, the selection of samples is subjective. Obviously, such data could be skewed by the researcher&#8217;s bias and prejudice. Judgmental sampling consequently generates a sample that is not representative of the entire population.<\/li>\n<li><strong>Convenience sampling<\/strong>: In this sampling method, a population element is selected based on how easily a researcher can access the element. Note that in this method, samples are selected conveniently, so they may not necessarily represent the whole population. This compromises the sampling accuracy.&nbsp;<\/li>\n<\/ol>\n<p>All else equal, probability sampling provides a more accurate and reliable representation of the population than non-probability sampling. A more convenient summary of sampling techniques is illustrated below:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-39307\" src=\"https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling.jpg\" alt=\"\" width=\"1590\" height=\"1596\" srcset=\"https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling.jpg 1590w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-300x300.jpg 300w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-1020x1024.jpg 1020w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-150x150.jpg 150w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-768x771.jpg 768w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-1530x1536.jpg 1530w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-400x402.jpg 400w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-24x24.jpg 24w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-48x48.jpg 48w, https:\/\/analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2021\/09\/Probability-and-Non-Probability-Sampling-96x96.jpg 96w\" sizes=\"auto, (max-width: 1590px) 100vw, 1590px\" \/><\/p>\n<blockquote>\n<h2><strong>Question<\/strong><\/h2>\n<p>A junior analyst wishes to study the spending patterns of employed investment professionals. To ease his data collection process, he selects only investment professionals in his firm. Which of the following is the <em>most likely<\/em> sampling method the analyst used?<\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li>Cluster sampling.<\/li>\n<li>Convenience sampling.<\/li>\n<li>Judgmental sampling.<\/li>\n<\/ol>\n<p><strong>Solution<\/strong><\/p>\n<p>The correct answer is <strong>B.<\/strong><\/p>\n<p>In convenience sampling, a population element is selected based on how easily a researcher can access it. Clearly, the analyst used convenience sampling since he only focused on the investment professionals in his firm. Obviously, his choice was guided by the ease with which he could access the investment professionals in his firm.&nbsp;<\/p>\n<p><strong>A is incorrect<\/strong>. Cluster sampling is a type of probability sampling, which cannot fit in this context.<\/p>\n<p><strong>C is incorrect<\/strong>. Judgmental sampling involves handpicking elements from a sample based on a researcher&#8217;s knowledge and expertise.<\/p>\n<\/blockquote>\n<div style=\"background-color:#f5f7fa; padding:32px 20px; text-align:center; margin:40px 0; border-radius:8px;\">\n\n  <a href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener noreferrer\"\n     style=\"display:inline-block; background-color:#1a73e8; color:#ffffff; text-decoration:none; font-size:16px; font-weight:600; padding:12px 28px; border-radius:999px; line-height:1.4;\">\n    Start Free Trial \u2192\n  <\/a>\n\n  <p style=\"margin:14px auto 0; max-width:620px; font-size:15px; line-height:1.6; color:#444444;\">\n    Build CFA Level I readiness with structured study materials, guided learning, and focused practice across quantitative methods and statistical concepts.\n  <\/p>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A population is the total number of elements in a group while a sample is a portion of the population. Sample statistics\u2014quantities such as sample mean that describe sample data\u2014generalize the information about the population parameter. As such, we draw&#8230;<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-31237","post","type-post","status-publish","format-standard","hentry","category-quantitative-methods","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Probability &amp; Non-Probability Sampling Methods | CFA Level 1<\/title>\n<meta name=\"description\" content=\"Here are the types of probability and non-probability sampling in research. 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