The HP12C Platinum
has the same instructions.
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 a S on top.) |
Entering data | |||
one variable | |||
Enter the first number in the list. Press . Enter the second number in the list and press . Continue for all numbers in the list. | |||
two variables | |||
Enter the first y-value in the list and press . Enter the first x-value in the list and press . Type in each ordered pair in the same fashion - y-value first,, x-value last, . |
Calculating one-variable statistics | ||||
mean (x) | ||||
Press . (You should see x below the 0.) | ||||
standard deviation for populations (s or s_{n}) | ||||
There's no direct key for s, but here's a fancy way around that. Press . | ||||
standard deviation for samples (s or s_{n-1}) | ||||
Press . (You should see an s below the decimal point.) |
Calculating two-variable statistics |
|||||
r (correlation) | |||||
Press (you should see ,r under the 2) . | |||||
regression coefficients | |||||
slope | |||||
Press you should see ,r under the 2. | |||||
y-intercept | |||||
Press . |
Calculating combinations and
permutations Again, the HP 12C has no direct commands, but we can use the factorial button to compute nCr and nPr. |
||||
combinations (nCr) | ||||
Enter the n-value. Press . Enter the r-value. Press . Enter the difference between n and r. Press . | ||||
permutations (nPr) | ||||
Enter the n-value. Press . Enter the difference between n and r. 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 | (S) |
2: Enter Data | |
3: Compute the mean | (x) |
4: Compute the population standard deviation | |
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 | (S) |
2: Enter Data | |
3: Compute the slope of the regression line | |
4: Compute the y-intercept of the regression line | |
5: Compute the correlation |
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.
1:Compute _{10}C_{6} |
(n!) (10 - 6 is 4) |
2: Compute _{9}P_{5} | (n!) (9 - 5 = 4) |
You should get _{10}C_{6 }= 210 and _{9}P_{5}=
15120.
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