About IntroStatsCalc
IntroStatsCalc is a set of free statistics calculators built for students in introductory college statistics.
What makes it different
- Every answer is explained. Each result starts with a one-sentence interpretation in plain English, the way you'd write it on an exam.
- It shows the steps behind each answer, so you can check your hand work.
- It matches the TI-84. Results use TI notation (x̄, Sx, σx) and quartile rules, and each page shows the matching calculator keystrokes.
- Graphs update as you type, with the area or p-value shaded.
Accuracy
The calculations are checked automatically against a standard statistics library and against worked TI-84 examples every time the site is updated. If you ever find an answer that doesn't match your calculator or textbook, please let us know.
Who made it
IntroStatsCalc was created by a community college mathematics instructor who wanted his students to have a clean, ad-light tool that teaches rather than just answers.