The position of the graphically represented keys can be found by moving your mouse on top of the graphic. 

Turn your calculator on
Press Upper Right Corner.
Clearing the memory
Turn the calculator off, then on again.  (That is, press Row 1 Column 5 Upper Right Corner)

 

Entering data
one variable
Enter the first number, then press Row 4, Column 1.  The screen will now say n=1 indicating that you have entered one data point.  Enter the second number, press Row 4, Column 1.  The screen will now say  n=2 because you have entered two data points.   Continue until all the data has been entered.
two variables
The TI-30Xa does not do regression.

 

Calculating one-variable statistics
mean (x)
Press Row 1, Column 1 Row 3, Column 3 (you should see x above the key).
standard deviation for populations (s or sn)
Press Row 1, Column 1 Row 3, Column 5 (you should see sxn above the division sign).
standard deviation for samples (s or sn-1)
Press Row 1, Column 1 Row 3 , Column 4 (you should see sxn-1above the square root sign).

Calculating two-variable statistics

r (correlation)
The TI-30Xa does not do regression.
regression coefficients
slope
The TI-30Xa does not do regression.
y-intercept
The TI-30Xa does not do regression.


Calculating combinations and permutations
combinations (nCr)
Enter the n value.  Press Row 1, Column 1    It's Yellow Row 3, Column 1 (you should see double arrows above the pi key), then the r value. Then press Row 1, Column 1    It's Yellow Row 5, Column 3 (you should see nCr over the 8 key).

Curiously, there is a second way. Enter the n value. Press Row 3, Column 5. Enter the r value. Press Row 1, Column 1    It's Yellow Row 5, Column 3 Row 8   Column 5 . We have no idea why this works.

permutations (nPr)
Enter the n value.  Press Row 1, Column 1    It's Yellow Row 3, Column 1 (you should see double arrows above the pi key), then the r value. Then press Row 1, Column 1    It's Yellow Row 5, Column 4 (you should see nPr over the 9 key). 

Curiously, there is a second way. Enter the n value. Press Row 4   Column 5. Enter the r value. Press Row 1, Column 1    It's Yellow Row 5, Column 4 Row 8   Column 5 . We have no idea why this works.

 

Turning the calculator off
Press Row 1 Column 5.

 

Worked Out Examples

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


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

15      16      20      21

1: Clear Memory  Row 1 Column 5 Upper Right Corner
2: Enter Data   Row 7, Column 2 Row 6, Column 3 Row 4, Column 1 Row 7, Column 2 Row 6, Column 4 Row 4, Column 1
 
Row 7, Column 3 Row 8, Column 2 Row 4, Column 1 Row 7, Column 3 Row 7, Column 2 Row 4, Column 1 
3: Compute the mean  Row 1, Column 1    It's Yellow Row 3, Column 3 (x)
4: Compute the standard deviation (population)  Row 1, Column 1    It's Yellow Row 3, Column 5 (sxn)
5: Compute the standard deviation (sample)  Row 1, Column 1    It's Yellow Row 3 , Column 4 (sxn-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   Row 7, Column 2 Row 8, Column 2 Row 1, Column 1    It's Yellow Row 3, Column 1 Row 6, Column 4 Row 1, Column 1    It's Yellow Row 5, Column 3 (nCr)
2: Compute 9P5  Row 5, Column 4 Row 1, Column 1    It's Yellow Row 3, Column 1 Row 6, Column 3 Row 1, Column 1    It's Yellow Row 5, Column 4 (nPr)


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

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