Category
Statistics & Data calculators
Summary statistics turn a list of numbers into a handful you can compare. The calculation is simple; the interpretation is where people slip — sample versus population, mean versus median, whether an outlier is distorting the picture.
The statistics calculator shows each measure with its working, including the squared-deviation table behind standard deviation, so you can follow the method instead of trusting a black box.
All statistics & data tools
What you can do here
- Summarise a data set in one pass
- See how a single outlier shifts the mean but not the median
- Compare sample and population standard deviation
- Check a statistics worksheet
Learn the method first
Guides in this category teach the idea, then hand you to the matching calculator to practise.
Questions about this category
Sample or population standard deviation — which should I use?
Use the population version when your numbers are every member of the group you care about. Use the sample version when they are a sample drawn from something larger. The calculator reports both.