The TI30X IIB has
the exact same keys as the TI30X 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 .  
Clearing the memory  
Press (you should see STAT above the key). A menu is displayed with three choices. Press so that the word CLRDATA is underlined. Press (you should see ENTER on the key). 
Entering data  
one variable  
Press (you should see the word STAT above the key). A menu is displayed with three choices. The 1VAR option should be underlined. Press (or ENTER), then again. If 1VAR is not underlined, use arrow keys to underline it. Type in the first number, then press . 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 . However, if the number occurs more than once in the data set, type in the number of times it occurs and then hit . You should see FRQ= (frequency). Then enter the second number from the data set. Press . Enter the frequency of the second number and hit again. Continue until all the data has been entered. Press as your final step to signal the end of the data set.  
two variables  
Press (you should see STAT above the key). A menu is displayed with three choices. Press once so that the word 2VAR is underlined. Press . Type in the first xvalue, press . Type in the corresponding y value, then . Continue until all the data has been entered. Press as your final step to signal the end of the data set. 
Calculating onevariable statistics  
mean (x)  
Press . On the top of the screen, you'll see a list of the values the calculator computes. Use 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 s_{n})  
Press . On the top of the screen, you'll see a list of the values the calculator computes. Use to move the cursor to s_{x} (it's the fourth thing in the list). The population standard deviation will be on the screen.  
standard deviation for samples (s or s_{n1})  
Press . On the top of the screen, you'll see a list of the values the calculator computes. Use to move the cursor to S_{x} (it's the third thing in the list). The sample standard deviation will be on the screen. 
Calculating twovariable statistics Make sure you are still in the 2VAR mode when you do these. 

r (correlation)  
Press . On the top of the screen, you'll see a list of the values the calculator computes. Use 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 . On the top of the screen, you'll see a list of the values the calculator computes. Use to move the cursor to a (it's the eighth thing in the list). The slope will be on the screen.  
yintercept  
Press . On the top of the screen, you'll see a list of the values the calculator computes. Use 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 (says EXIT STAT on top of the key). 

combinations (nCr)  
Enter the nvalue. Press (short for PRoBability). On the top of the screen, you'll see a list of the values the calculator computes. Use to move the cursor to nCr (it's the second thing in the list). Enter the r value, then press .  
permutations (nPr)  
Enter the nvalue. Press ( short for PRoBability). On the top of the screen, you'll see a list of the values the calculator computes. Use to move the cursor to nPr (it's the first thing in the list). Enter the r value, then press . 
Turning the calculator off  
Press . (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 e^{x} as (e^{x}).
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  (CLRDATA) 
2: Enter Data 

3: Compute the mean  
4: Compute the standard deviation (population)  
5: Compute the standard deviation (sample) 
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  (CLRDATA) 
2: Enter Data 

3: Compute the slope of the regression line  (seven times) 
4: Compute the yintercept of the regression line  (eight times) 
5: Compute the correlation  (nine times) 
You should get a slope of 1.6, a yintercept of 0.5, and a
correlation of 0.992277876.
The regression line would be: y = 1.6x+0.5.
1: Compute _{10}C_{6}  (nCr) 
2: Compute _{9}P_{5}  (nPr) 
You should get _{10}C_{6 }= 210 and _{9}P_{5}= 15120.
For more information, consult a manual.
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