Statistics calculators

Compare three groups at once with F, p and eta squared.

Mean, median, mode and range from a list.

Turn a test result into a real posterior probability.

Probability of k successes in n trials.

Goodness of fit test statistic.

Relative variability — compare spread across different scales.

P(A|B) from P(A and B) and P(B).

Margin of error and interval around a sample mean.

Pearson r for two data sets.

Turn a mean and standard deviation into the 68%, 95% and 99.7% intervals.

Expected value of a discrete outcome list.

Draws without replacement — cards, lotteries, quality samples.

IQR, quartiles and outlier fences.

Best fit line for paired data.

Odds of matching all numbers in a lottery draw.

The ± figure behind any poll or survey result.

Average distance from the mean, in the original units.

Probabilities under the bell curve.

IQR fences and z-scores flag unusual points instantly.

Percentile rank of a value within a dataset.

Probability of k events in an interval.

Combined probability of independent events.

Q1, median, Q3 and five number summary.

How many responses you need for a reliable survey.

Sample and population spread, variance and standard error.

One-sample and two-sample t statistics.

Sample and population variance.

Averages where some values count more than others.

Standard score, percentile and tail probabilities.

One-sample z-test with p-value and confidence interval.