P-Value & Statistical Significance: What Every School Leader Needs to Know

In 2015, a science writer for FiveThirtyEight asked a room full of scientists to define the p-value — and got almost no clear answers. If the people who use it daily struggle to explain it, it's no wonder it feels like jargon. In this video, Dr. Matthew Courtney breaks it down in plain language: what a p-value actually is, what the 0.05 threshold means, and why statistical significance alone is never enough to make a sound school decision. ⏱ CHAPTERS 0:00 — Introduction: Why P-Value Confuses Even Scientists 0:20 — What Is a P-Value? (Plain Language Definition) 0:47 — Null Hypothesis vs. Alternative Hypothesis 1:41 — How P-Value Quantifies Evidence Against the Null 2:00 — Significance Levels: The 0.05 Threshold Explained 2:30 — Real-World Example: Testing an E-Learning Platform 3:09 — Why Statistical Significance Alone Is Not Enough 3:35 — Free Data Analysis Tools & Key Takeaway In this video, you'll learn: ✅ What a p-value actually measures — in plain language, not statistical jargon: the probability that your observed results happened by chance if the null hypothesis is true ✅ The difference between the null hypothesis and the alternative hypothesis — and why understanding both is the prerequisite to understanding any p-value result ✅ What the 0.05 significance threshold means and where it actually comes from — spoiler: it's largely arbitrary, and knowing that makes you a more critical consumer of research ✅ A real school example: a district pilots an e-learning platform, runs the analysis, and gets a p-value of 0.03 — walk through exactly what that number means and what the right next step is ✅ Why a statistically significant result is the beginning of the analysis, not the end — how to pair p-value with measures of central tendency, effect size, and qualitative evidence before making any program decision ✅ Dr. Courtney's free data analysis tools — test statistical significance on your own school data without building formulas from scratch This is part of the Evidence Empowered Educator (E3) Method — translating peer-reviewed research into strategies you can use Monday morning. 🔔 Subscribe for weekly evidence-based strategies for K-12 school leaders — no fluff, no motivational anecdotes, just what the research says. #PValue #StatisticalSignificance #EducationStatistics #DataDrivenDecisionMaking #PrincipalLeadership