This is the only calculator I've found that is specifically designed for statistics.
The position of the graphically represented keys can be found by moving your mouse on top of the graphic.
Turn your calculator on  
Flick the S61 switch on the top right of your calculator.  
Clearing the memory  
Press . If you're doing linear regression, flick the other switch to GP2 and press . 
Entering data  
one variable  
For each number in your list, enter the number and press .  
two variables  
Enter the first xvalue and press . Enter the first yvalue and press . Enter the other pairs in the same way. 
Calculating onevariable statistics  
mean (x)  
Press . You should see x above the key.  
standard deviation for populations (s or s_{n})  
Press . You should see s' above the key.  
standard deviation for samples (s or s_{n1})  
Press . You should see s above the key. 
Calculating twovariable statistics 

r (correlation)  
Press .  
regression coefficients  
slope  
Press .  
yintercept  
Press . 
Calculating combinations and permutations  
combinations (nCr)  
Enter r and press . Enter n and press . Note the reversal of the usual order.  
permutations (nPr)  
Enter r and press . Enter n and press . Note the reversal of the usual order. 
Turning the calculator off  
Flick the S61 switch off. 
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  
2: Enter Data  
3: Compute the mean  ( x ) 
4: Compute the population standard deviation  (s') 
5: Compute the sample standard deviation  (s) 
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  Flick switch to GP2 
2: Enter Data  
3: Compute the slope of the regression line  
4: Compute the yintercept of the regression line  
5: Compute the correlation 
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.
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