{"id":1577,"date":"2019-10-01T13:29:00","date_gmt":"2019-10-01T13:29:00","guid":{"rendered":"https:\/\/analystprep.com\/cfa-level-1-exam\/?p=1577"},"modified":"2026-03-08T18:06:55","modified_gmt":"2026-03-08T18:06:55","slug":"calculation-interpretation-standard-error-sample-mean","status":"publish","type":"post","link":"https:\/\/analystprep.com\/cfa-level-1-exam\/quantitative-methods\/calculation-interpretation-standard-error-sample-mean\/","title":{"rendered":"Calculation and Interpretation of the Standard Error of the Sample Mean"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"VideoObject\",\n  \"name\": \"Sampling and Estimation (2021 Level I CFA\u00ae Exam \u2013 Reading 10)\",\n  \"description\": \"This video lesson covers sampling and estimation techniques, highlighting simple and stratified random sampling, sampling errors, and the central limit theorem. It explains concepts like confidence intervals, standard error, t-distributions, and biases (data mining, survivorship, look-ahead, time-period). Practical examples emphasize their application in financial and statistical analysis.\",\n  \"uploadDate\": \"2019-12-18T00:00:00+00:00\",\n  \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/mgY_3CHHYBw\/default.jpg\",\n  \"contentUrl\": \"https:\/\/youtu.be\/mgY_3CHHYBw\",\n  \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/mgY_3CHHYBw\",\n  \"duration\": \"PT32M\"\n}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"QAPage\",\n  \"mainEntity\": {\n    \"@type\": \"Question\",\n    \"name\": \"Assume that we have increased the sample size to 80 in the example above and derived similar values for the mean and standard deviation of returns. Estimate the standard error of the sample mean.\",\n    \"text\": \"Assume that we have increased the sample size to 80 in the example above and derived similar values for the mean and standard deviation of returns. Estimate the standard error of the sample mean.\\n\\nA. 0.01\\nB. 0.02\\nC. 0.08\",\n    \"answerCount\": 3,\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"The correct answer is A.\\n\\nSx = S \/ \u221an\\nSx = 0.13 \/ \u221a80 = 0.01\\n\\nThis clearly proves that increasing the sample size reduces the SE of the sample mean.\"\n    }\n  }\n}\n<\/script>\n\n\n\n<iframe loading=\"lazy\"\n  width=\"611\"\n  height=\"344\"\n  src=\"https:\/\/www.youtube.com\/embed\/mgY_3CHHYBw\"\n  title=\"YouTube video player\"\n  frameborder=\"0\"\n  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"\n  referrerpolicy=\"strict-origin-when-cross-origin\"\n  allowfullscreen>\n<\/iframe>\n\n\n\n<p>The standard error (SE) of the sample mean refers to the standard deviation of the distribution of the sample means. It gives analysts an estimate of the variability they would expect if they were to draw multiple samples from the same population. While the standard deviation measures the variability obtained within one sample, the standard error gives an estimate of the variability between many samples.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Standard Error of the Sample Mean Formula<\/strong><\/h2>\n\n\n\n<p>Provided the population standard deviation, \u03c3, is known, analysts use the following formula to estimate the standard error of the sample mean, denoted as \u03c3<sub>x<\/sub>:<\/p>\n\n\n\n<p>$$ \\sigma_x=\\cfrac {\\sigma}{\\sqrt n} $$<\/p>\n\n\n\n<p>Where n is the sample size.<\/p>\n\n\n\n<p>However, the population standard deviation, \u03c3, is usually unknown. In such a case, the following formula is used to estimate the standard error of the sample mean, also denoted as S<sub>x<\/sub>:<\/p>\n\n\n\n<p>$$ S_x =\\cfrac {S}{\\sqrt n} $$<\/p>\n\n\n\n<p>Where S is the sample standard deviation; and \\(S^2 =\\cfrac {\\sum \\left(X_i- X \\right)^2}{n- 1}&nbsp; \\).<\/p>\n\n\n\n<div style=\"margin:24px 0;\">\n  <a href=\"https:\/\/analystprep.com\/free-trial\/\"\n     target=\"_blank\"\n     rel=\"noopener noreferrer\"\n     style=\"\n       display:block;\n       width:100%;\n       text-align:center;\n       padding:16px 20px;\n       border:2px solid #2f5bff;\n       border-radius:50px;\n       background-color:#f5f7ff;\n       color:#2f5bff;\n       font-size:18px;\n       font-weight:500;\n       text-decoration:none;\n       line-height:1.3;\n     \">\n     Practice standard error questions in our free trial.\n  <\/a>\n<\/div>\n\n\n<h2><strong>Breaking Down the Standard Error of the Sample Mean<\/strong><\/h2>\n<p>The standard error of the sample mean gives analysts an idea of how <strong>precisely <\/strong>the sample mean estimates the population mean. A lower value of the standard error indicates a more precise estimation of the population mean. On the other hand, a larger value of the standard error indicates a less precise estimate of the population mean.<\/p>\n<p>It\u2019s also important to note that the standard error becomes smaller as the sample size increases. This happens because increasing the sample size ultimately brings the sample mean closer to the true value of the population mean.<\/p>\n<h3><strong>Example: Calculating the Standard Error of the Sample Mean When the Population Standard Deviation is Known<\/strong><\/h3>\n<p>In a certain property investment company with an international presence, workers have a mean hourly wage of $12 with a population standard deviation of $3. Given a sample size of 30, estimate and interpret the SE of the sample mean:<\/p>\n<p>$$ \\begin{align*} \\sigma_x &amp; =\\cfrac {\\sigma}{\\sqrt n} \\\\ &amp; =\\cfrac {3}{\\sqrt {30}} \\\\ &amp; = $0.55 \\\\ \\end{align*} $$<\/p>\n<p>Interpretation: if we were to draw several samples of size 30 from the employee population and construct a sampling distribution of the sample means, we would end up with a mean of $12 and a standard error of $0.55.<\/p>\n<h3><strong>Example: Calculating the Standard Error of the Sample Mean When \u03c3 is Unknown<\/strong><\/h3>\n<p>A sample of 30 latest returns on XYZ stock reveals a mean return of $4 with a sample standard deviation of $0.13. Estimate the SE of the sample mean.<\/p>\n<p>$$ \\begin{align*} S_x &amp; =\\cfrac {S}{\\sqrt n} \\\\ &amp; =\\cfrac {0.13}{\\sqrt {30}} \\\\ &amp; = $0.02 \\\\ \\end{align*} $$<\/p>\n<p>Interpretation: If we were to draw more samples from the population of yearly returns on XYZ stock and construct a sample mean distribution, we would end up with a mean of $4 and a standard error of $0.02.<\/p>\n<blockquote>\n<h2><strong>Question<\/strong><\/h2>\n<p>Assume that we have increased the sample size to 80 in the example above and derived similar values for the mean and standard deviation of returns. Estimate the standard error of the sample mean.<\/p>\n<p>A. 0.01<\/p>\n<p>B. 0.02<\/p>\n<p>C. 0.08<\/p>\n<p><strong>Solution<\/strong><\/p>\n<p>The correct answer is A.<\/p>\n<p>$$ \\begin{align*} S_x &amp; =\\cfrac {S}{\\sqrt n} \\\\ &amp; = \\cfrac {0.13}{\\sqrt {80}} \\\\ &amp; = $0.01 \\\\ \\end{align*} $$<\/p>\n<p>This clearly proves that increasing the sample size reduces the SE of the sample mean.<\/p>\n<\/blockquote>\n<p><em>Reading 10 LOS 10f:<\/em><\/p>\n<p><em>Calculate and interpret the standard error of the sample mean<\/em><\/p>\n<div class=\"notes_inv\"><hr \/>\n<p><a href=\"https:\/\/analystprep.com\/cfa-level-1-exam\/quantitative-methods\/learning-sessions-curriculum\/\"><em>Quantitative Methods \u2013 Learning Sessions<\/em><\/a><\/p>\n<\/div>\n\n\n<div style=\"text-align:center;margin:50px 0 30px;\">\n\n  <a href=\"https:\/\/analystprep.com\/free-trial\/\"\n     target=\"_blank\"\n     rel=\"noopener noreferrer\"\n     style=\"\n       display:inline-block;\n       padding:14px 34px;\n       background:linear-gradient(135deg,#4a74d1,#3b66c4);\n       color:#ffffff;\n       font-size:18px;\n       font-weight:600;\n       text-decoration:none;\n       border-radius:50px;\n       box-shadow:0 6px 18px rgba(59,102,196,0.25);\n     \">\n     Start Free Trial\n  <\/a>\n\n  <p style=\"\n       margin:18px auto 0;\n       max-width:620px;\n       font-size:16px;\n       line-height:1.6;\n       color:#333333;\n     \">\n     Strengthen your understanding of sampling distributions and standard error estimation with CFA Level I exam-style practice questions.\n  <\/p>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The standard error (SE) of the sample mean refers to the standard deviation of the distribution of the sample means. It gives analysts an estimate of the variability they would expect if they were to draw multiple samples from the&#8230;<\/p>\n","protected":false},"author":2,"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-1577","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 v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Standard Error Example Question | CFA Level 1 - AnalystPrep<\/title>\n<meta name=\"description\" content=\"The standard error (SE) of the sample mean is a statistical term which refers to the standard deviation of the distribution of the sample means\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/analystprep.com\/cfa-level-1-exam\/quantitative-methods\/calculation-interpretation-standard-error-sample-mean\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Standard Error Example Question | CFA Level 1 - 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