The TI-30X IIB has the exact same keys as the TI-30X IIS. S is the solar version of the calculator and B is the battery operated version.
The position of the graphically represented keys can be found by moving your mouse on top of the graphic. 

Turn your calculator on
Press Row 9, Column 1 Bottom Left Corner The Right Arrow Key: Upper Right Hand Corner.
Clearing the memory
Press The Second Key: Row 1, Column 1 The Data Key: Row 3, Column 3 (you should see STAT above the key).  A menu is displayed with three choices.  Press The Right Arrow Key: Upper Right Hand Corner The Right Arrow Key: Upper Right Hand Corner so that the word CLRDATA is underlined.  Press The Equals Key: Row 9, Column 5 (you should see ENTER on the key). 

 

Entering data
one variable
Press Row 1, Column 1 Row 3, Column 3 (you should see the word STAT above the key).  A menu is displayed with three choices.  The 1-VAR option should be underlined.  Press Bottom Right (or ENTER), then Row 3, Column 3 again.  If 1-VAR is not underlined, use arrow keys to underline it.  Type in the first number, then press The Down Arrow Key: Upper Right Hand Corner.  Next the calcuIator is expecting a frequency (how many times this value occurs in your data set).  1 is the default value, so if this number occurs only once in the data set,  press The Down Arrow Key: Upper Right Hand Corner.  However, if the number occurs more than once in the data set, type in the number of times it occurs and then hit The Down Arrow Key: Upper Right Hand Corner.  You should see FRQ= (frequency).  Then enter the second number from the data set.  Press The Down Arrow Key: Upper Right Hand Corner.  Enter the frequency of the second number and hit The Down Arrow Key: Upper Right Hand Corner again.  Continue until all the data has been entered.  Press Bottom Right as your final step to signal the end of the data set.
two variables
Press Row 1, Column 1 Row 3, Column 3 (you should see STAT above the key).  A menu is displayed with three choices.  Press The Right Arrow Key: Upper Right Hand Corner once so that the word 2-VAR is underlined.  Press Bottom Right Row 3, Column 3.  Type in the first x-value, press The Down Arrow Key: Upper Right Hand Corner. Type in the corresponding y value, then The Down Arrow Key: Upper Right Hand Corner.  Continue until all the data has been entered.  Press Bottom Right as your final step to signal the end of the data set.

 

Calculating one-variable statistics
mean (x)
Press The Stat Var Key: Row 3, Column 4.  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to  x (it's the second thing in the list).  The mean value will be on the screen.
standard deviation for populations (s or sn)
Press The Stat Var Key: Row 3, Column 4.  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to sx (it's the fourth thing in the list).  The population standard deviation will be on the screen.
standard deviation for samples (s or sn-1)
Press The Stat Var Key: Row 3, Column 4.  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to Sx (it's the third thing in the list).  The sample standard deviation will be on the screen.

Calculating two-variable statistics

Make sure you are still in the 2-VAR mode when you do these.
r (correlation)
Press The Stat Var Key: Row 3, Column 4.  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to r (it's the tenth thing in the list).  The correlation will be on the screen.
regression coefficients
slope
Press The Stat Var Key: Row 3, Column 4.  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to a (it's the eighth thing in the list).  The slope will be on the screen.
y-intercept
Press The Stat Var Key: Row 3, Column 4.  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to b (it's the ninth thing in the list).  The correlation will be on the screen.


Calculating combinations and permutations

Make sure you get out of the STAT mode before doing these.  To get out of STAT mode, press The Second Key: Row 1, Column 1 The Stat Var Key: Row 3, Column 4 (says EXIT STAT on top of the key).
combinations (nCr)
Enter the n-value.  Press The P R B Key: Row 2, Column 2 (short for PRoBability).  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to nCr (it's the second thing in the list).  Enter the r value, then press The Equals Key: Row 9, Column 5.
permutations (nPr)
Enter the n-value.  Press The P R B Key: Row 2, Column 2 ( short for PRoBability).  On the top of the screen, you'll see a list of the values the calculator computes.  Use The Right Arrow Key: Upper Right Hand Corner to move the cursor to nPr (it's the first thing in the list).  Enter the r value, then press The Equals Key: Row 9, Column 5.

 

Turning the calculator off
Press The Second Key: Row 1, Column 1 The On Key: Row 9, Column 1. (You should see the word OFF above the key.)

 

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

Do alt tags: The One Key is Row 8, Column 2

1: Clear Memory  Row 1, Column 1 Row 3, Column 3 (CLRDATA) Bottom Right Corner
2: Enter Data  Row 1, Column 1 Row 3, Column 3 Bottom Right Corner Row 3, Column 3 The One Key: Row 8, Column 2 The row dips a little.  
 Bottom Right Corner 
3: Compute the mean  Row 3, Column 4  
4: Compute the standard deviation (population)  Row 3, Column 4
5: Compute the standard deviation (sample)  Row 3, Column 4


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

B: Find the linear regression line for the following table of numbers. Also find the correlation.

x 1 2 3 4
y 2 4 5 7

1: Clear Memory  Row 1, Column 1 Row 3, Column 3 (CLRDATA) Bottom Right Corner
2: Enter Data  Row 1, Column 1 Row 3, Column 3 Bottom Right Corner Row 3, Column 3  
 
3: Compute the slope of the regression line  Row 3, Column 4 (seven times)
4: Compute the y-intercept of the regression line  Row 3, Column 4 (eight times)
5: Compute the correlation  Row 3, Column 4 (nine times)


    You should get a slope of 1.6, a y-intercept of 0.5, and a correlation of 0.992277876.
    The regression line would be: y = 1.6x+0.5.

C: Find 10C6 and 9P5.
1: Compute 10C6  Row 1, Column 1 Row 3, Column 4 Row 2, Column 2 (nCr) Bottom Right Corner 
2: Compute 9P5  Row 1, Column 1 Row 3, Column 4 Row 2, Column 2 (nPr) Bottom Right Corner 

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

For more information, consult a manual. 

Go to: 

TI's online manual sample problem set Home page
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