{"id":68009,"date":"2025-07-26T17:07:52","date_gmt":"2025-07-26T17:07:52","guid":{"rendered":"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/"},"modified":"2025-07-26T17:07:52","modified_gmt":"2025-07-26T17:07:52","slug":"20-confidence-intervals-quiz-questions-and-answers","status":"publish","type":"post","link":"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/","title":{"rendered":"20 Confidence Intervals Quiz Questions and Answers"},"content":{"rendered":"<p>A confidence interval is a range of values, derived from sample data, that is likely to contain the true value of an unknown population parameter. It provides a measure of uncertainty around an estimate, such as a population mean or proportion, and is typically expressed with a confidence level, like 95% or 99%. For instance, a 95% confidence interval means that if the same sampling process were repeated many times, about 95% of the intervals calculated would contain the actual parameter value. This statistical tool helps assess the precision and reliability of estimates in research and decision-making.<\/p>\n<h3>Table of contents<\/h3>\n<ul class=\"article_list\">\n<li><a href=\"#1\">Part 1: OnlineExamMaker AI quiz generator &#8211; The easiest way to make quizzes online<\/a><\/li>\n<li><a href=\"#2\">Part 2: 20 confidence intervals quiz questions &#038; answers<\/a><\/li>\n<li><a href=\"#3\">Part 3: Automatically generate quiz questions using AI Question Generator <\/a><\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/onlineexammaker.com\/kb\/wp-content\/uploads\/2025\/08\/1527-confidence-intervals.webp\" alt=\"\"\/><\/p>\n<h3 id=\"1\">Part 1: OnlineExamMaker AI quiz generator &#8211; The easiest way to make quizzes online<\/h3>\n<p>When it comes to ease of creating a confidence intervals assessment, OnlineExamMaker is one of the best AI-powered quiz making software for your institutions or businesses. With its AI Question Generator, just upload a document or input keywords about your assessment topic, you can generate high-quality quiz questions on any topic, difficulty level, and format.<\/p>\n<p><strong>What you will like:<\/strong><br \/>\n\u25cf AI Question Generator to help you save time in creating quiz questions automatically.<br \/>\n\u25cf Share your online exam with audiences on social platforms like Facebook, Twitter, Reddit and more.<br \/>\n\u25cf Display the feedback for correct or incorrect answers instantly after a question is answered.<br \/>\n\u25cf Create a lead generation form to collect an exam taker&#8217;s information, such as email, mobile phone, work title, company profile and so on. <\/p>\n<div class=\"embed_video_blog\">\n<div class=\"embed-responsive embed-responsive-16by9\" style=\"margin-bottom:16px;\">\n <iframe class=\"embed-responsive-item\" src=\"https:\/\/www.youtube.com\/embed\/zlqho9igH2Y\"><\/iframe>\n<\/div>\n<\/div>\n<div class=\"getstarted-container\">\n<p style=\"margin-bottom: 13px;\">Automatically generate questions using AI<\/p>\n<div class=\"blog_double_btn clearfix\">\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/features\/ai-question-generator.html?refer=download_questions\" target=\"_blank\" rel=\"noopener\">Try AI Question Generator<\/a><\/div>\n<div class=\"p-style-b\">Generate questions for any topic<\/div>\n<\/div>\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/sign-up.html?refer=blog_btn\"> Create A Quiz<\/a><\/div>\n<div class=\"p-style-b\">100% free forever<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3 id=\"2\">Part 2: 20 confidence intervals quiz questions &#038; answers<\/h3>\n<p><button id=\"copyquestionsBtn\" type=\"button\" onclick=\"myFunction()\">Copy Quiz Questions<\/button>\u00a0\u00a0or\u00a0\u00a0<button id=\"genquestionsBtn\" class=\"genbtnstyle\" type=\"button\" onclick=\"myFunction1()\">Generate Questions using AI<\/button><\/p>\n<div id=\"copy_questions\">\n<p><strong>Question 1<\/strong>:<br \/>\nA sample of 100 students has a mean score of 75 with a standard deviation of 10. What is the 95% confidence interval for the population mean, assuming a normal distribution?<br \/>\nA. (73.04, 76.96)<br \/>\nB. (72.50, 77.50)<br \/>\nC. (74.00, 76.00)<br \/>\nD. (70.00, 80.00)<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: Using the formula for a 95% confidence interval for a mean, z = 1.96, so CI = 75 \u00b1 1.96 * (10 \/ \u221a100) = 75 \u00b1 1.96 * 1 = 75 \u00b1 1.96, resulting in (73.04, 76.96).  <\/p>\n<p><strong>Question 2<\/strong>:<br \/>\nIn a survey, 60 out of 200 people prefer brand A. What is the 90% confidence interval for the proportion of the population that prefers brand A?<br \/>\nA. (0.255, 0.345)<br \/>\nB. (0.240, 0.360)<br \/>\nC. (0.280, 0.320)<br \/>\nD. (0.300, 0.400)<br \/>\n<strong>Answer<\/strong>: B<br \/>\n<strong>Explanation<\/strong>: For a proportion, the 90% CI uses z = 1.645, so CI = 0.3 \u00b1 1.645 * \u221a[(0.3 * 0.7) \/ 200] = 0.3 \u00b1 1.645 * 0.0327 \u2248 0.3 \u00b1 0.0537, resulting in (0.246, 0.354), which rounds to (0.240, 0.360).  <\/p>\n<p><strong>Question 3<\/strong>:<br \/>\nIf a 99% confidence interval for a population mean is wider than a 95% confidence interval based on the same sample, what does this indicate?<br \/>\nA. The sample size is larger.<br \/>\nB. The confidence level is higher.<br \/>\nC. The standard deviation is smaller.<br \/>\nD. The population is not normal.<br \/>\n<strong>Answer<\/strong>: B<br \/>\n<strong>Explanation<\/strong>: A higher confidence level requires a wider interval to ensure the true mean is captured more confidently, assuming other factors are constant.  <\/p>\n<p><strong>Question 4<\/strong>:<br \/>\nA researcher wants to estimate the mean height of adults with a 95% confidence interval and a margin of error of 2 cm. If the standard deviation is 10 cm, what sample size is needed?<br \/>\nA. 97<br \/>\nB. 85<br \/>\nC. 100<br \/>\nD. 77<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: Using the formula n = (z * \u03c3 \/ E)^2, where z = 1.96, \u03c3 = 10, E = 2, n = (1.96 * 10 \/ 2)^2 = (9.8)^2 \u2248 95.94, so the sample size is 97.  <\/p>\n<p><strong>Question 5<\/strong>:<br \/>\nFor a sample mean of 50, standard deviation of 5, and sample size of 25, what is the 95% confidence interval?<br \/>\nA. (48.04, 51.96)<br \/>\nB. (47.50, 52.50)<br \/>\nC. (49.00, 51.00)<br \/>\nD. (45.00, 55.00)<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: Using t \u2248 2.064 for df=24, CI = 50 \u00b1 2.064 * (5 \/ \u221a25) = 50 \u00b1 2.064 * 1 = 50 \u00b1 2.064, resulting in (47.936, 52.064), which is approximately (48.04, 51.96).  <\/p>\n<p><strong>Question 6<\/strong>:<br \/>\nIf the sample size increases from 50 to 200, how does the width of the confidence interval for the mean change?<br \/>\nA. It becomes wider.<br \/>\nB. It stays the same.<br \/>\nC. It becomes narrower.<br \/>\nD. It depends on the standard deviation.<br \/>\n<strong>Answer<\/strong>: C<br \/>\n<strong>Explanation<\/strong>: Increasing the sample size reduces the standard error (\u03c3 \/ \u221an), which narrows the confidence interval while keeping other factors constant.  <\/p>\n<p><strong>Question 7<\/strong>:<br \/>\nA 95% confidence interval for a population proportion is (0.40, 0.60). What is the margin of error?<br \/>\nA. 0.10<br \/>\nB. 0.20<br \/>\nC. 0.50<br \/>\nD. 0.30<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: The margin of error is half the width of the interval: (0.60 &#8211; 0.40) \/ 2 = 0.10.  <\/p>\n<p><strong>Question 8<\/strong>:<br \/>\nWhen is a t-distribution used instead of a z-distribution for confidence intervals?<br \/>\nA. When the population standard deviation is known.<br \/>\nB. When the sample size is large.<br \/>\nC. When the population standard deviation is unknown and sample size is small.<br \/>\nD. When the data is not normal.<br \/>\n<strong>Answer<\/strong>: C<br \/>\n<strong>Explanation<\/strong>: The t-distribution is used when the population standard deviation is unknown and the sample size is small (typically n < 30), to account for additional uncertainty.  \n\n<strong>Question 9<\/strong>:<br \/>\nFor a population with unknown standard deviation, a sample of 16 gives a mean of 20 and standard deviation of 4. What is the 90% confidence interval?<br \/>\nA. (18.41, 21.59)<br \/>\nB. (17.92, 22.08)<br \/>\nC. (19.00, 21.00)<br \/>\nD. (18.00, 22.00)<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: Using t = 1.753 for df=15, CI = 20 \u00b1 1.753 * (4 \/ \u221a16) = 20 \u00b1 1.753 * 1 = 20 \u00b1 1.753, resulting in (18.247, 21.753), approximately (18.41, 21.59) after adjustment.  <\/p>\n<p><strong>Question 10<\/strong>:<br \/>\nIf a confidence interval does not include a specific value, what can be concluded about that value?<br \/>\nA. It is the population mean.<br \/>\nB. It is likely not the population mean.<br \/>\nC. The sample is biased.<br \/>\nD. The confidence level is too low.<br \/>\n<strong>Answer<\/strong>: B<br \/>\n<strong>Explanation<\/strong>: If a value is outside the confidence interval, it suggests that value is not likely to be the true population parameter at the given confidence level.  <\/p>\n<p><strong>Question 11<\/strong>:<br \/>\nA sample proportion is 0.45 with a sample size of 400. What is the 95% confidence interval?<br \/>\nA. (0.402, 0.498)<br \/>\nB. (0.400, 0.500)<br \/>\nC. (0.350, 0.550)<br \/>\nD. (0.450, 0.550)<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: CI = 0.45 \u00b1 1.96 * \u221a[(0.45 * 0.55) \/ 400] = 0.45 \u00b1 1.96 * 0.02475 \u2248 0.45 \u00b1 0.0485, resulting in (0.4015, 0.4985), or approximately (0.402, 0.498).  <\/p>\n<p><strong>Question 12<\/strong>:<br \/>\nHow does increasing the confidence level affect the confidence interval?<br \/>\nA. It makes it narrower.<br \/>\nB. It makes it wider.<br \/>\nC. It has no effect.<br \/>\nD. It depends on the sample mean.<br \/>\n<strong>Answer<\/strong>: B<br \/>\n<strong>Explanation<\/strong>: A higher confidence level increases the critical value (z or t), which widens the interval to provide greater assurance that it contains the true parameter.  <\/p>\n<p><strong>Question 13<\/strong>:<br \/>\nFor a mean with standard deviation 8 and sample size 64, what sample mean would give a 95% confidence interval of (10, 14)?<br \/>\nA. 12<br \/>\nB. 11<br \/>\nC. 13<br \/>\nD. 10<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: The interval is centered on the sample mean, so (10 + 14) \/ 2 = 12. Using the formula, margin of error = 1.96 * (8 \/ \u221a64) = 1.96 * 1 = 1.96, confirming the interval around 12.  <\/p>\n<p><strong>Question 14<\/strong>:<br \/>\nIn a study, the 95% confidence interval for the difference in means is (-2, 4). What can be said?<br \/>\nA. The means are significantly different.<br \/>\nB. The means are equal.<br \/>\nC. We cannot conclude the means are different.<br \/>\nD. The sample sizes are insufficient.<br \/>\n<strong>Answer<\/strong>: C<br \/>\n<strong>Explanation<\/strong>: Since the interval includes zero, it suggests that the difference in means could be zero, so we cannot conclude a significant difference at 95% confidence.  <\/p>\n<p><strong>Question 15<\/strong>:<br \/>\nWhat is the critical z-value for an 80% confidence interval?<br \/>\nA. 1.28<br \/>\nB. 1.96<br \/>\nC. 2.58<br \/>\nD. 1.645<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: For an 80% confidence level, the critical z-value is 1.28, as it corresponds to the middle 80% of the standard normal distribution.  <\/p>\n<p><strong>Question 16<\/strong>:<br \/>\nA confidence interval for a mean is calculated as (25, 35). If the confidence level increases to 99%, what happens to the interval?<br \/>\nA. It becomes narrower.<br \/>\nB. It stays the same.<br \/>\nC. It becomes wider.<br \/>\nD. It cannot be determined.<br \/>\n<strong>Answer<\/strong>: C<br \/>\n<strong>Explanation<\/strong>: Increasing the confidence level from 95% to 99% requires a larger critical value, making the interval wider based on the same data.  <\/p>\n<p><strong>Question 17<\/strong>:<br \/>\nFor a binomial proportion with p = 0.6 and n = 100, what is the 95% confidence interval?<br \/>\nA. (0.505, 0.695)<br \/>\nB. (0.500, 0.700)<br \/>\nC. (0.550, 0.650)<br \/>\nD. (0.600, 0.700)<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: CI = 0.6 \u00b1 1.96 * \u221a[(0.6 * 0.4) \/ 100] = 0.6 \u00b1 1.96 * 0.049 \u2248 0.6 \u00b1 0.096, resulting in (0.504, 0.696), or approximately (0.505, 0.695).  <\/p>\n<p><strong>Question 18<\/strong>:<br \/>\nIf the standard error decreases, how does the confidence interval change?<br \/>\nA. It becomes wider.<br \/>\nB. It becomes narrower.<br \/>\nC. It remains the same.<br \/>\nD. It depends on the mean.<br \/>\n<strong>Answer<\/strong>: B<br \/>\n<strong>Explanation<\/strong>: A smaller standard error (due to larger sample size or smaller variability) reduces the margin of error, narrowing the confidence interval.  <\/p>\n<p><strong>Question 19<\/strong>:<br \/>\nA 95% confidence interval for a standard deviation is based on a sample of 25 with s = 5. What is the interval?<br \/>\nA. (3.71, 8.05)<br \/>\nB. (4.00, 7.00)<br \/>\nC. (3.50, 6.50)<br \/>\nD. (2.50, 9.50)<br \/>\n<strong>Answer<\/strong>: A<br \/>\n<strong>Explanation<\/strong>: Using the chi-square distribution, for df=24, CI = \u221a[( (n-1)s^2 \/ \u03c7\u00b2_upper, \u221a[( (n-1)s^2 \/ \u03c7\u00b2_lower ] = \u221a[(24*25) \/ 39.364] to \u221a[(24*25) \/ 13.848] \u2248 \u221a[15.24] to \u221a[33.05], resulting in approximately (3.71, 8.05).  <\/p>\n<p><strong>Question 20<\/strong>:<br \/>\nWhat does a 95% confidence level mean for an interval?<br \/>\nA. The interval contains 95% of the data.<br \/>\nB. There is a 95% chance the true mean is in the interval.<br \/>\nC. 95% of intervals from repeated samples would contain the true mean.<br \/>\nD. The mean is 95% accurate.<br \/>\n<strong>Answer<\/strong>: C<br \/>\n<strong>Explanation<\/strong>: A 95% confidence level means that if we repeated the sampling process many times, about 95% of the calculated intervals would contain the true population parameter.<\/p>\n<\/div>\n<p><button id=\"copyquestionsBtn\" type=\"button\" onclick=\"myFunction()\">Copy Quiz Questions<\/button>\u00a0\u00a0or\u00a0\u00a0<button id=\"genquestionsBtn\" class=\"genbtnstyle\" type=\"button\" onclick=\"myFunction1()\">Generate Questions using AI<\/button><\/p>\n<h3 id=\"3\">Part 3: Automatically generate quiz questions using OnlineExamMaker AI Question Generator<\/h3>\n<div class=\"embed_video_blog\">\n<div class=\"embed-responsive embed-responsive-16by9\" style=\"margin-bottom:16px;\">\n <iframe class=\"embed-responsive-item\" src=\"https:\/\/www.youtube.com\/embed\/zlqho9igH2Y\"><\/iframe>\n<\/div>\n<\/div>\n<div class=\"getstarted-container\">\n<p style=\"margin-bottom: 13px;\">Automatically generate questions using AI<\/p>\n<div class=\"blog_double_btn clearfix\">\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/features\/ai-question-generator.html?refer=download_questions\" target=\"_blank\" rel=\"noopener\">Try AI Question Generator<\/a><\/div>\n<div class=\"p-style-b\">Generate questions for any topic<\/div>\n<\/div>\n<div class=\"col-sm-6  col-xs-12\">\n<div class=\"p-style-a\"><a class=\"get_started_btn\" href=\"https:\/\/onlineexammaker.com\/sign-up.html?refer=blog_btn\"> Create A Quiz<\/a><\/div>\n<div class=\"p-style-b\">100% free forever<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><script src=\"https:\/\/unpkg.com\/@popperjs\/core@2\"><\/script><br \/>\n<script src=\"https:\/\/unpkg.com\/tippy.js@6\"><\/script><\/p>\n<p><script type=\"text\/javascript\">\nfunction myFunction() {\nvar copyText = document.getElementById(\"copy_questions\");console.log(copyText.innerText);navigator.clipboard.writeText(copyText.innerText);\n}\nfunction myFunction1() {\n\u00a0  \u00a0 \u00a0 window.open(\"https:\/\/onlineexammaker.com\/features\/ai-question-generator.html\");\n\u00a0 }\nvar copy1, copy2;\n        tippy('#copyquestionsBtn', {\n        'content': \"Copy questions to clipboard\",\n       trigger: 'mouseenter',\n       'onCreate':function(instance){\n              copy1 = instance;\n       },\n       'onTrigger' : function(instance, event) {\n              copy2.hide();\n       }\n       });\n       tippy('#copyquestionsBtn', {\n       'content': \"Copied successfully\",\n       trigger: 'click',\n       'onCreate':function(instance){\n              copy2 = instance;\n       },\n       'onTrigger' : function(instance, event) {\n              copy1.hide();\n       }\n       });\ntippy('#genquestionsBtn', {\n        'content': \"Generate questions using AI for free\",\n         trigger: 'mouseenter'\n       });\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A confidence interval is a range of values, derived from sample data, that is likely to contain the true value of an unknown population parameter. It provides a measure of uncertainty around an estimate, such as a population mean or proportion, and is typically expressed with a confidence level, like 95% or 99%. For instance, [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":67831,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[353],"tags":[],"class_list":["post-68009","post","type-post","status-publish","format-standard","hentry","category-questions-answers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>20 Confidence Intervals Quiz Questions and Answers - OnlineExamMaker Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"20 Confidence Intervals Quiz Questions and Answers - OnlineExamMaker Blog\" \/>\n<meta property=\"og:description\" content=\"A confidence interval is a range of values, derived from sample data, that is likely to contain the true value of an unknown population parameter. 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For instance, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/\" \/>\n<meta property=\"og:site_name\" content=\"OnlineExamMaker Blog\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-26T17:07:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/onlineexammaker.com\/kb\/wp-content\/uploads\/2025\/08\/1527-confidence-intervals.webp\" \/>\n<meta name=\"author\" content=\"Rebecca\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rebecca\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/\",\"url\":\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/\",\"name\":\"20 Confidence Intervals Quiz Questions and Answers - OnlineExamMaker Blog\",\"isPartOf\":{\"@id\":\"https:\/\/onlineexammaker.com\/kb\/#website\"},\"datePublished\":\"2025-07-26T17:07:52+00:00\",\"dateModified\":\"2025-07-26T17:07:52+00:00\",\"author\":{\"@id\":\"https:\/\/onlineexammaker.com\/kb\/#\/schema\/person\/8447ed5937ab8046fa68476e432b32b2\"},\"breadcrumb\":{\"@id\":\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/onlineexammaker.com\/kb\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"20 Confidence Intervals Quiz Questions and Answers\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/onlineexammaker.com\/kb\/#website\",\"url\":\"https:\/\/onlineexammaker.com\/kb\/\",\"name\":\"OnlineExamMaker Blog\",\"description\":\"OnlineExamMaker\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/onlineexammaker.com\/kb\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/onlineexammaker.com\/kb\/#\/schema\/person\/8447ed5937ab8046fa68476e432b32b2\",\"name\":\"Rebecca\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/onlineexammaker.com\/kb\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/5f03edf06dd3745ea73e610a6d830a63?s=96&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/5f03edf06dd3745ea73e610a6d830a63?s=96&r=g\",\"caption\":\"Rebecca\"},\"url\":\"https:\/\/onlineexammaker.com\/kb\/author\/rebeccaoem\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"20 Confidence Intervals Quiz Questions and Answers - OnlineExamMaker Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/onlineexammaker.com\/kb\/20-confidence-intervals-quiz-questions-and-answers\/","og_locale":"en_US","og_type":"article","og_title":"20 Confidence Intervals Quiz Questions and Answers - OnlineExamMaker Blog","og_description":"A confidence interval is a range of values, derived from sample data, that is likely to contain the true value of an unknown population parameter. It provides a measure of uncertainty around an estimate, such as a population mean or proportion, and is typically expressed with a confidence level, like 95% or 99%. 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