Statistics

Descriptive, inferential, sample size, A/B testing.

5 calculators · 4 sub-fields

Descriptive

2 calculators

Standard deviation Mean, median, sample or population standard deviation. →
Z-score calculator Z-score, percentile and p-value for a value in a normal distribution. →

Inferential

1 calculator

Confidence interval (mean) CI for the mean: x̄ ± z·(σ/√n) for known σ; t for small samples. →

Sample size

1 calculator

Sample size calculator Required sample size for a survey margin of error and confidence level. →

A/B test

1 calculator

A/B test significance calculator Compare two conversion rates: p-value, lift, statistical significance. →