The position of the graphically represented keys can be found by moving your mouse on top of the graphic.
Warning: On some old versions, the green key is actually orange. The commands are the same.
Turn your calculator on  
Press (you should see ON written below the key).  
Clearing the memory  
To clear the statistical memory, press (you should see CLS above the key). To clear all the memory, press (you should see CLEAR ALL above the key). 
Entering data  
one variable  
Enter the first number, then press . Enter the second number, then press . Continue until all the data has been entered.  
two variables  
Enter the first xvalue; press . Enter the first yvalue; press . Enter the second xvalue; press . Enter the second yvalue; press . Continue until all the data has been entered. 
Calculating onevariable statistics  
mean (x)  
Press (you should see x, y above the key).  
standard deviation for populations (s or s_{n})  
Press (you should see s_{x}, s_{y} above the key).  
standard deviation for samples (s or s_{n1})  
Press (you should see s_{x}, s_{y} above the key). 
Calculating twovariable statistics 

r (correlation)  
Press (you should see , r above the key). The screen will show you . Press (you should see SWAP above the key). Now the screen will show you r.  
regression coefficients  
slope  
Press (you are telling the calculator that you are interested in what happens at x=0; this will be important for the y intercept). Press (you should see , m above the key). The screen will show you (the predicted value for y if x=0). Press (you should see SWAP above the key). Now the screen will show you m, the slope.  
yintercept  
Press (you are telling the calculator that you are interested in what happens at x=0; we need this to get the y intercept). Press (you should see , m above the key). The screen will show you . Since this is the predicted value of y when x=0, it is also the yintercept. 
Calculating combinations and permutations  
combinations (nCr)  
This calculator has no direct way to do combinations. However, it has the factorial function, (has n! above it). To compute nCr, compute n! / [r!(nr)!].  
permutations (nPr)  
This calculator has no direct way to do permutations. However, it has the factorial function, (has n! above it). To compute nPr, compute n! / r! 
Turning the calculator off  
Press (should say OFF above it). 
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
1: Clear Memory  (CLS) 
2: Enter the data 

3: Compute the mean  (x, y) 
4: Compute the population standard deviation.  (s_{x}, s_{y}) 
5: Compute the sample standard deviation:  (s_{x}, s_{y}) 
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  (CLS) 
2: Enter Data 

3: Compute the slope of the regression line  (, m) (SWAP) 
4: Compute the yintercept of the regression line.  (, m) 
5: Compute the correlation.  (, r) (SWAP) 
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}  
2: Compute _{9}P_{5} 
You should get _{10}C_{6 }= 210 and _{9}P_{5}=
15120.
For more information, consult a manual.
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