midStatistics
What is p-value?
Updated May 17, 2026
Short answer
Probability of observing results assuming null hypothesis is true.
Deep explanation
A small p-value suggests evidence against the null hypothesis.
Real-world example
Used in A/B testing for website optimization.
Common mistakes
- Using p-value as effect size.
Follow-up questions
- What is significance level?
- What is confidence interval?