Frequentist Testing
01 Definition
Frequentist Testing meaning: The classical approach using significance thresholds and fixed sample sizes.
Frequentist testing judges results against a null hypothesis of no difference, using p-values and a set confidence level. It typically requires a sample size decided in advance and a fixed stopping point. It is the traditional method behind many A/B testing tools and statistics courses.
Also called
Why it matters
How Frequentist Testing fits the work
Frequentist methods provide a widely taught, standardized way to decide whether a result is unlikely to be chance, making tests comparable across teams.
In context
Using a frequentist test at 95 percent confidence, the team waited for the planned sample before checking whether the lift was significant.
Practical note
Peeking at results and stopping early breaks its assumptions and inflates false positives. Fix the sample size and duration before launch and read the result only at the end.