{"id":253062,"date":"2024-05-03T21:15:32","date_gmt":"2024-05-03T21:15:32","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=253062"},"modified":"2024-05-03T21:15:32","modified_gmt":"2024-05-03T21:15:32","slug":"why-does-p-value-have-to-be-less-than-0-05","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/","title":{"rendered":"Why does p-value have to be less than 0.05?"},"content":{"rendered":"<p>The concept of statistical significance and the p-value has become a fundamental part of scientific research and experimentation. In many fields, it has become common practice to set a threshold of 0.05 or lower as the criteria for determining whether a result is statistically significant. But why does the p-value have to be less than 0.05? Let&#8217;s explore this question and shed some light on this widely used threshold.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#Understanding_the_p-value\" title=\"Understanding the p-value\">Understanding the p-value<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#The_role_of_statistical_significance\" title=\"The role of statistical significance\">The role of statistical significance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#Why_does_p-value_have_to_be_less_than_005\" title=\"Why does p-value have to be less than 0.05?\">Why does p-value have to be less than 0.05?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#FAQs\" title=\"FAQs:\">FAQs:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#1_Is_a_p-value_less_than_005_always_significant\" title=\"1. Is a p-value less than 0.05 always significant?\">1. Is a p-value less than 0.05 always significant?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#2_Can_a_p-value_greater_than_005_still_indicate_a_real_effect\" title=\"2. Can a p-value greater than 0.05 still indicate a real effect?\">2. Can a p-value greater than 0.05 still indicate a real effect?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#3_Can_a_p-value_be_negative\" title=\"3. Can a p-value be negative?\">3. Can a p-value be negative?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#4_Are_p-values_the_only_factor_to_consider_in_interpreting_study_results\" title=\"4. Are p-values the only factor to consider in interpreting study results?\">4. Are p-values the only factor to consider in interpreting study results?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#5_Does_a_p-value_tell_us_anything_about_the_magnitude_or_clinical_importance_of_an_effect\" title=\"5. Does a p-value tell us anything about the magnitude or clinical importance of an effect?\">5. Does a p-value tell us anything about the magnitude or clinical importance of an effect?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#6_Is_a_lower_p-value_always_better\" title=\"6. Is a lower p-value always better?\">6. Is a lower p-value always better?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#7_Can_a_study_with_a_p-value_slightly_above_005_still_be_valuable\" title=\"7. Can a study with a p-value slightly above 0.05 still be valuable?\">7. Can a study with a p-value slightly above 0.05 still be valuable?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#8_Are_there_alternative_methods_to_p-values_for_assessing_statistical_significance\" title=\"8. Are there alternative methods to p-values for assessing statistical significance?\">8. Are there alternative methods to p-values for assessing statistical significance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#9_Should_all_scientific_fields_use_the_same_p-value_threshold\" title=\"9. Should all scientific fields use the same p-value threshold?\">9. Should all scientific fields use the same p-value threshold?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#10_Is_a_smaller_p-value_more_reliable\" title=\"10. Is a smaller p-value more reliable?\">10. Is a smaller p-value more reliable?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#11_Can_a_p-value_alone_tell_us_the_cause_of_an_observed_effect\" title=\"11. Can a p-value alone tell us the cause of an observed effect?\">11. Can a p-value alone tell us the cause of an observed effect?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#12_Should_policy_decisions_be_based_solely_on_p-values\" title=\"12. Should policy decisions be based solely on p-values?\">12. Should policy decisions be based solely on p-values?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Understanding_the_p-value\"><\/span>Understanding the p-value<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before we dive into the significance of a p-value less than 0.05, it is important to understand what the p-value represents. The p-value is a measure of the strength of evidence against the null hypothesis. In simple terms, it tells us the probability of observing a test statistic as extreme as the one calculated, assuming the null hypothesis is true. In other words, it measures the likelihood that the observed data occurred by chance alone.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_role_of_statistical_significance\"><\/span>The role of statistical significance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Statistical significance is a way to determine if the results of an analysis are likely due to a real effect or if they could be explained by random chance. A p-value less than 0.05 is often used as the threshold for statistical significance. If the calculated p-value is below this threshold, it suggests that the observed effect is unlikely to be due to chance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_does_p-value_have_to_be_less_than_005\"><\/span><strong>Why does p-value have to be less than 0.05?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The p-value threshold of 0.05 is a convention that has emerged over time, mainly due to historical reasons and the desire for a standard approach to determining statistical significance. It is important to note that this threshold is somewhat arbitrary and not universally applicable to all scientific fields. However, a p-value less than 0.05 has been widely adopted as a commonly used criterion for statistical significance.<\/p>\n<p>The choice of 0.05 as the threshold is based on the balance between two types of errors in hypothesis testing: type I and type II errors. A type I error occurs when the null hypothesis is rejected, even though it is true. In this case, we falsely conclude that there is a significant effect. On the other hand, a type II error occurs when the null hypothesis is accepted, even though it is false. This means we fail to detect a real effect.<\/p>\n<p>Setting the p-value threshold at 0.05 helps strike a reasonable balance between these two types of errors. It is a practical compromise that provides reasonable assurance that a significant effect is indeed present while keeping the risk of false discoveries reasonably low.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_Is_a_p-value_less_than_005_always_significant\"><\/span>1. Is a p-value less than 0.05 always significant?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, a p-value less than 0.05 does not always guarantee statistical significance. It is merely an arbitrary threshold commonly used in many fields.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Can_a_p-value_greater_than_005_still_indicate_a_real_effect\"><\/span>2. Can a p-value greater than 0.05 still indicate a real effect?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, a p-value greater than 0.05 does not necessarily mean that there is no real effect. It simply suggests that the observed effect could have occurred by chance at a higher probability.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Can_a_p-value_be_negative\"><\/span>3. Can a p-value be negative?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, by definition, the p-value cannot be negative. It ranges from 0 to 1, with values close to 0 indicating strong evidence against the null hypothesis.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Are_p-values_the_only_factor_to_consider_in_interpreting_study_results\"><\/span>4. Are p-values the only factor to consider in interpreting study results?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, p-values are just one piece of the puzzle. It is crucial to consider effect sizes, confidence intervals, study design, and other relevant factors in interpreting study results.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Does_a_p-value_tell_us_anything_about_the_magnitude_or_clinical_importance_of_an_effect\"><\/span>5. Does a p-value tell us anything about the magnitude or clinical importance of an effect?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, the p-value only informs us about the statistical evidence against the null hypothesis. It does not provide information about the size or practical relevance of the effect.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Is_a_lower_p-value_always_better\"><\/span>6. Is a lower p-value always better?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA lower p-value does indicate stronger evidence against the null hypothesis, but it is not necessarily &#8220;better&#8221; in all cases. The context, research question, and available evidence should all be considered.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Can_a_study_with_a_p-value_slightly_above_005_still_be_valuable\"><\/span>7. Can a study with a p-value slightly above 0.05 still be valuable?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, studies with p-values slightly above 0.05 can still be valuable. The p-value threshold is just one factor to consider, and the overall body of evidence should be evaluated.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Are_there_alternative_methods_to_p-values_for_assessing_statistical_significance\"><\/span>8. Are there alternative methods to p-values for assessing statistical significance?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, there are alternative methods such as confidence intervals, Bayesian statistics, and effect sizes that provide complementary information to p-values in assessing statistical significance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Should_all_scientific_fields_use_the_same_p-value_threshold\"><\/span>9. Should all scientific fields use the same p-value threshold?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, the choice of p-value threshold should take into account the specific field, research question, and the potential impact of false positives and false negatives.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Is_a_smaller_p-value_more_reliable\"><\/span>10. Is a smaller p-value more reliable?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA smaller p-value indicates stronger evidence against the null hypothesis, but it does not necessarily mean the study or experiment is more reliable. The overall study design, methodology, and potential biases also affect reliability.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Can_a_p-value_alone_tell_us_the_cause_of_an_observed_effect\"><\/span>11. Can a p-value alone tell us the cause of an observed effect?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, a p-value alone cannot determine the cause of an observed effect. It only informs us about the likelihood of the observed data occurring by chance under the null hypothesis.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Should_policy_decisions_be_based_solely_on_p-values\"><\/span>12. Should policy decisions be based solely on p-values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nPolicy decisions and real-world implications should not solely rely on p-values. Other important factors such as effect sizes, practical significance, and broader context should be considered in decision-making processes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The concept of statistical significance and the p-value has become a fundamental part of scientific research and experimentation. In many fields, it has become common practice to set a threshold of 0.05 or lower as the criteria for determining whether a result is statistically significant. But why does the p-value have to be less than &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Why does p-value have to be less than 0.05?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/why-does-p-value-have-to-be-less-than-0-05\/#more-253062\">Read more<span class=\"screen-reader-text\">Why does p-value have to be less than 0.05?<\/span><\/a><\/p>\n","protected":false},"author":64,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-253062","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why does p-value have to be less than 0.05?<\/title>\n<meta name=\"description\" content=\"The concept of statistical significance and the p-value has become a fundamental part of scientific research and experimentation. 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