How to Use Statistics on the BA II Plus
DATA collects the points, STAT reports the numbers. One-variable mode is what most exam problems need: n, mean, sample Sx and population σx.
Step by step
- 1
Open DATA and enter the points
2ND + 7; each value then [ENTER], [↓] to the next. 2ND CLR WORK wipes the set.
[2ND][DATA]2[ENTER][↓]4[ENTER]
- 2
Open STAT in one-variable mode
2ND + 8 shows the mode row (1-V); 2ND SET cycles if needed.
[2ND][STAT]
- 3
Read the statistics
[↓] walks n, x̄, Sx, σx, Σx, Σx². CPT refreshes the row you are on.
[↓][↓][↓][CPT]
Worked example (T13): data 2, 4, 6, 8
Mean x̄ = 5.00; sample Sx = 2.58 (2.581989) with the n − 1 denominator; population σx = 2.24 (2.236068) with n. Same data — two questions.
[2ND][DATA]2[ENTER][↓]4[ENTER][↓]6[ENTER][↓]8[ENTER][2ND][STAT][↓][↓][↓][CPT]
Web practice cannot replace the physical calculator in a proctored exam — only calculators on the exam organizer’s current list are allowed.
Frequently asked questions
Sx or σx for exam answers?
+
Unless the question says “population”, report the sample statistic Sx (n − 1). The two differ by √(n/(n−1)).
How many points fit?
+
The DATA worksheet holds up to 80 one-variable entries; this site’s statistics form is unlimited.