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

 Turn your calculator on Press . Clearing the memory Turn the calculator off, then on again.  (That is, press )

 Entering data one variable Enter the first number, then press .  The screen will now say n=1 indicating that you have entered one data point.  Enter the second number, press .  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 (you should see x above the key). standard deviation for populations (s or sn) Press  (you should see sxn above the division sign). standard deviation for samples (s or sn-1) Press (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 (you should see double arrows above the pi key), then the r value. Then press (you should see nCr over the 8 key). Curiously, there is a second way. Enter the n value. Press . Enter the r value. Press . We have no idea why this works. permutations (nPr) Enter the n value.  Press (you should see double arrows above the pi key), then the r value. Then press (you should see nPr over the 9 key).  Curiously, there is a second way. Enter the n value. Press . Enter the r value. Press . We have no idea why this works.

 Turning the calculator off Press .

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 2: Enter Data 3: Compute the mean (x) 4: Compute the standard deviation (population) (sxn) 5: Compute the standard deviation (sample) (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 (nCr) 2: Compute 9P5 (nPr)

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

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