Dawnbridge

TI-84 Plus CE field manual for IB Math

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21

Descriptive statistics from data

All courses

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.

Goal

Find the descriptive statistics for the data set ​4,  ​7,  ​7,  ​8,  ​10,  ​12.

1

Open the list editor: press and choose 1: Edit.

2

Enter the data values in L1: 4, 7, 7, 8, 10, 12. Press after each value.

3

Run one-variable statistics: press , move to CALC, choose 1-Var Stats, set List = L1 (type L1 with ), leave FreqList blank, and choose Calculate.

NORMALFLOATAUTOREALRADIANMP
1-Var Stats
x̄=8
Σx=48
Σx²=422
Sx=2.75680975
σx=2.516611478
n=6
minX=4
Q1=7
Med=7.5
Q3=10
maxX=12
Result

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. 1

    Find the mean and both standard deviations for the data set ​6,  ​9,  ​9,  ​11,  ​14,  ​17.

  2. 2

    Find the mean and both standard deviations for ​2.5,  ​3.1,  ​3.4,  ​3.4,  ​4.0,  ​4.6,  ​5.0.

  3. 3

    Find the mean and both standard deviations for ​12,  ​15,  ​15,  ​18,  ​20,  ​22,  ​25,  ​25.