Dual Powered Scientific Calculator

The position of the graphically represented keys can be found by moving your mouse on top of the graphic. 

Turn your calculator on
	Press . The word on appears on top of the key.
Clearing the memory
	Press . (You should see ->SD above the key.) Now press to clear the memory.

Entering data
	one variable
		Enter the first value, then press . Enter the second value, then press . Continue until the end of the list.
	two variables
		The calculator does not do two-variable statistics.

Calculating one-variable statistics
	mean (x)
		Press . You should see x above the key.
	standard deviation for populations (s or sn)
		Press . You should see sn above the key.
	standard deviation for samples (s or sn-1)
		Press . You should see sn-1 above the key.

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
2: Enter Data
3: Compute the mean	(x)
4: Compute the standard deviation (population)	(sn)
5: Compute the standard deviation (sample)	(sn-1)

    You should get a mean of 18, population standard deviation of 2.549509757, and a sample standard deviation of 2.943920289.

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