--- title: What are Type I and Type II errors? | daily.dev description: A brief explainer on Type I and Type II errors in statistical hypothesis testing. Type I errors (false positives) occur when a true null hypothesis is... canonical: https://daily.dev/posts/what-are-type-i-and-type-ii-errors--nczvhm8pu twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: What are Type I and Type II errors? | daily.dev og:description: A brief explainer on Type I and Type II errors in statistical hypothesis testing. Type I errors (false positives) occur when a true null hypothesis is... og:url: https://daily.dev/posts/what-are-type-i-and-type-ii-errors--nczvhm8pu og:image: https://api.daily.dev/og/posts/nCzvHM8pU.png og:image:alt: What are Type I and Type II errors? og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # What are Type I and Type II errors? **[Medium](https://daily.dev/sources/medium_js)** · 2 min read · 0 upvotes · 0 comments ## Summary A brief explainer on Type I and Type II errors in statistical hypothesis testing. Type I errors (false positives) occur when a true null hypothesis is incorrectly rejected, with probability denoted by α. Type II errors (false negatives) occur when a false null hypothesis is not rejected, with probability denoted by β. Key relationships include the trade-off between the two error types, the role of sample size in reducing both, and statistical power defined as 1 − β. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Power Analysis in Marketing: A Hands-On Introduction](https://daily.dev/posts/power-analysis-in-marketing-a-hands-on-introduction-surzxo4ht) · Towards Data Science · 1 upvotes · 0 comments --- Tags: [#data-science](https://daily.dev/tags/data-science), [#statistics](https://daily.dev/tags/statistics) [View this post on daily.dev](https://daily.dev/posts/what-are-type-i-and-type-ii-errors--nczvhm8pu) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"What are Type I and Type II errors?","url":"https://daily.dev/posts/what-are-type-i-and-type-ii-errors--nczvhm8pu","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/what-are-type-i-and-type-ii-errors--nczvhm8pu"},"datePublished":"2026-07-12T06:58:26.618Z","dateModified":"2026-07-12T06:59:15.520Z","description":"A brief explainer on Type I and Type II errors in statistical hypothesis testing. Type I errors (false positives) occur when a true null hypothesis is...","image":"https://media.daily.dev/image/upload/s--HRgLpUt6--/f_auto/v1722860399/public/Placeholder%2003","thumbnailUrl":"https://media.daily.dev/image/upload/s--HRgLpUt6--/f_auto/v1722860399/public/Placeholder%2003","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/what-are-type-i-and-type-ii-errors--nczvhm8pu","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"data-science,statistics","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"What are Type I and Type II errors?"}]} ```