The statistics student
toolbox.
Explore distributions, confidence intervals, tests and robust summaries.
9 useful places to start.
Read the sampling assumptions and conventions alongside each result; calculations do not validate a statistical model.
Binomial probability calculator
Find exact and cumulative success probabilities for independent trials.
Poisson probability calculator
Explore event-count probabilities for a supplied average rate.
Normal interval probability
Find the probability inside and outside an interval under a normal model.
Normal percentile value
Find the value below which a chosen share of a normal distribution lies.
Confidence interval for a mean
Estimate a mean interval using a sample and Student’s t distribution.
One-sample t test
Compare a numeric sample mean with a supplied reference value.
Welch two-sample t test
Compare independent sample means without assuming equal variances.
Spearman rank correlation
Measure the association between two paired lists using ranks.
Histogram frequency table
Bin a numeric list into equal-width intervals with cumulative counts.
A few things you
can tick off.
- Compare exact and cumulative probabilities
- Explore a sample mean’s confidence interval
- Understand ranks and tied observations