The position of the graphically represented keys can be found by moving your mouse on top of the graphic.
The ON/C Key does not count as a row. Row 1 starts with the x! key.

Turn your calculator on
Press The ON - C Key Top Right. (You should see the word ON to the right of the key.)
Clearing the memory
Press The Second Key Row 3 Column 1 The x-factorial Key: Row 1 Column 1 (CSR - Clear Statistical Register is written above the key.) Pressing The Off Key: Row 1 Column 5 and then The ON - C Key Top Right has the same effect.

 

Entering data
one variable
Type in first number.  Press The Sigma Plus Key: Row 4 Column 1 (you should see DT below the key, in blue).  Type in second number.  Press The Sigma Plus Key: Row 4 Column 1.  Continue until all the data has been entered.
two variables
The TI-30 STAT cannot do two variable statistics.

 

Calculating one-variable statistics
mean
Press The Second Key Row 3 Column 1 The Store Key: Row 5 Column 1 (x).
standard deviation for populations (s or sn)
Press The Second Key Row 3 Column 1 The Sum Key: Row 7 Column 1 (sn).
standard deviation for samples (s or sn-1)
Press The Second Key Row 3 Column 1 The Recall Key: Row 6 Column 1 (sn-1 ).

Calculating two-variable statistics
r (correlation)
The TI-30 STAT cannot do correlations.
regression coefficients
slope
The TI-30 STAT cannot do slopes of regression.
y-intercept
The TI-30 STAT cannot do y-intercepts of regression.


Calculating combinations and permutations
combinations (nCr)
There is no direct way of doing combinations. However, nCr = Formula for n choose r. So enter n and press The x-factorial Key: Row 1 Column 1. Press The division Key: Row 3 Column 5. Enter r and press The x-factorial Key: Row 1 Column 1. Press The division Key: Row 3 Column 5. Subtract r from n and press  The x-factorial Key: Row 1 Column 1. Press The equals Key: Rows 7,8 Column 5.
permutations (nPr)
There is no direct way of doing combinations. However, nPr = n!/r!. So enter n and press The x-factorial Key: Row 1 Column 1. Press The division Key: Row 3 Column 5. Enter r and press The x-factorial Key: Row 1 Column 1. Press The equals Key: Rows 7,8 Column 5.

 

Turning the calculator off
Press The Off Key: Row 1 Column 5.

 

Worked Out Examples

In the following examples, we list the exact key sequence used to find the answer.  We list the keys by the main symbol on the key.  In parentheses we include a helpful mnemonic, e.g. (ex).


A: What is the mean and standard deviation of the following list of numbers?

15      16      20      21

1: Clear Memory  The Second Key Row 3 Column 1 The x-factorial Key: Row 1 Column 1 (CSR)
2: Enter the data:  The One Key: Row 7 Column 2 The Five Key: Row 6 Column 3 The Sigma Plus Key: Row 4 Column 1 The One Key: Row 7 Column 1 The Six Key: Row 6 Column 4 The Sigma Plus Key: Row 4 Column 1 The Two Key: Row 7 Column 3 The Zero Key: Row 8 Column 2 The Sigma Plus Key: Row 4 Column 1 The Two Key: Row 7 Column 3 The One Key: Row 7 Column 2 The Sigma Plus Key: Row 4 Column 1
3: Compute the mean  The Second Key Row 3 Column 1 The Store Key: Row 5 Column 1 (x)
4: Compute the standard deviation (population):  The Second Key Row 3 Column 1 The Sum Key: Row 7 Column 1 (sn)
5: Compute the standard deviation (sample):  The Second Key Row 3 Column 1 The Recall Key: Row 6 Column 1 (sn-1 )


    You should get a mean of 18, population standard deviation of 2.549509757, and a sample standard deviation of 2.943920289.

C: Find 10C6 and 9P5.
1: Compute 10C6 The One Key: Row 7 Column 2 The Zero Key: Row 8 Column 2 The x-factorial Key: Row 1 Column 1 The division Key: Row 3 Column 5 The Six Key: Row 6 Column 4 The x-factorial Key: Row 1 Column 1 The division Key: Row 3 Column 5 The Four Key: Row 6 Column 2 The x-factorial Key: Row 1 Column 1 The equals Key: Rows 7,8 Column 5
2: Compute 9P5  The Nine Key: Row 5 Column 4 The x-factorial Key: Row 1 Column 1 The division Key: Row 3 Column 5 The Five Key: Row 6 Column 3 The x-factorial Key: Row 1 Column 1 The equals Key: Rows 7,8 Column 5


You should get 10C6 = 210 and 9P5= 15120.

For more information, consult a manual.

Click here for the sample problem set.

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