TI-Nspire CX II field manual for IB Math
Descriptive statistics from data
Enter one-variable data into a table or list, run the calculator's one-variable statistics command, and read the mean, standard deviations, and count.
Find the descriptive statistics for the data set 4, 7, 7, 8, 10, 12.
Open a Lists & Spreadsheet page, name the first column x, and enter the data values 4, 7, 7, 8, 10, 12.
Run one-variable statistics: press → 4: Statistics → 1: Stat Calculations → 1: One-Variable Statistics. Leave Num of Lists: 1 and press , then between the fields to select x as the X1 list.
Press to calculate. The Nspire writes the one-variable summary statistics into the spreadsheet.
The calculator gives xˉ=8, sx≈2.76, σx≈2.52, and n=6.
Your turn
Work each one on your calculator, then check the answer.
- 1
Find the mean and both standard deviations for the data set 6, 9, 9, 11, 14, 17.
- 2
Find the mean and both standard deviations for 2.5, 3.1, 3.4, 3.4, 4.0, 4.6, 5.0.
- 3
Find the mean and both standard deviations for 12, 15, 15, 18, 20, 22, 25, 25.