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A/B testing & experimentation

User bucketing, experiment metrics, statistical comparison, and rollout guardrails.

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How to Perform Welch's t-Test in Python

Calculate the Welch t-statistic and degrees of freedom for two samples with unequal variances using Python's statistics module.

statistics t-test hypothesis-testing
Python 
import math
from statistics import mean, variance


def welch_t_test(sample1, sample2):
    n1, n2 = len(sample1), len(sample2)
    mean1, mean2 = mean(sample1), mean(sample2)
    var1, var2 = variance(sample1), variance(sample2)

    # Welch's t statistic
    t_stat = (mean1 - mean2) / math.sqrt(var1 / n1 + var2 / n2…
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