Statistics Calculator
Paste or type your data points: count, mean, sample standard deviation (Sx, n−1), population standard deviation (σx, n) and the sums — the DATA and STAT worksheets on one page.
Data points (line or space separated)
One-variable results
Worked example (T13): 2, 4, 6, 8 → mean 5.00, sample Sx 2.58, population σx 2.24.
BA II Plus keystrokes
- [2ND] [DATA]
- 2[ENTER]
- [↓]4[ENTER]
- [↓]6[ENTER]
- [↓]8[ENTER]
- [2ND] [STAT][↓][↓][↓][CPT]
Key map (same as the simulator): 2ND P/Y = P/Y worksheet · 2ND BGN = mode · 2ND CLR WORK = clear the open worksheet · 2ND CLR TVM = clear TVM.
Worked example — Sx vs σx (T13)
Data 2, 4, 6, 8: mean 5.00, sample Sx 2.58 (2.581989), population σx 2.24 (2.236068). Same data, two denominators — Sx divides by n − 1, σx by n.
Frequently asked questions
Sx or σx — which is “the” standard deviation?
Sx treats your data as a sample (n − 1, unbiased); σx treats it as the whole population (n). Exams usually expect the sample statistic unless told otherwise.
How many points can I enter?
The form is unrestricted; the physical calculator’s DATA worksheet holds up to 80 one-variable points.