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 CA, for clear all, above the key). 
Entering data  
one variable  
Press . This gets you into the single variable mode. On the shell, it says 0:SD (for standard deviation). [Note: The modes are explained on the top of the calculator.] Enter the first number, then . Enter the next number, then . Continue until all the data has been entered.  
two variables  
Press . This gets you into the linear regression mode. On the shell, it says 1:a+bx (for linear regression). [Note: the modes are explained on the top of the calculator.] Enter the first xvalue. Press . You should see (x,y) below the key. On the screen you should see your xvalue followed by a comma. Enter the corresponding yvalue, then . You should see n=1 on the screen, indicating that you have entered one ordered pair. Enter the other ordered pairs in the same way. 
Calculating onevariable statistics  
mean (x)  
Press (you should see x in green above the key).  
standard deviation for populations (s or s_{n})  
Press (you should see s_{x} in green above the key).  
standard deviation for samples (s or s_{n1})  
Press (you should see s_{x }in green above the key). 
Calculating twovariable statistics 

r (correlation)  
Press (you should see r in green above the key).  
regression coefficients  
slope  
Press (you should see b above the key).  
yintercept  
Press (you should see a above the key). 
Calculating combinations and permutations  
combinations (nCr)  
Enter the n value. Press (you should see nCr in yellow above the key). Enter the r value and press .  
permutations (nPr)  
Enter the n value. Press (you should see nPr in yellow above the key). Enter the r value and press . 
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 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  (CA) 
2: Enter Data 

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

3: Compute the slope of the regression line  (b) 
4: Compute the yintercept of the regression line  (a) 
5: Compute the correlation  (r) 
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}  (nCr) 
You should get _{10}C_{6 }= 210 and _{9}P_{5}=
15120.
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