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# HP 6s Calculator - Using Statistics

Introduction
The HP 6s scientific calculator can be put into the statistics mode by pressing MODE, then SD. With the statistics mode, data can be entered and analyzed.
Calculator symbol key
The procedures in this document use the following text to represent symbol keys:
 Key Description Text representation Sum of x. SUMx Sum of x2 SUMx2 Sample standard deviation STDV Population standard deviation PSTDV
Entering a list of data items to analyze
Press DATA after each data element. When DATA is pressed, the calculator displays the number of data elements entered. For example to enter a list of data consisting of 5, 8, and -3, use the following keystrokes: Press 5, DATA, 8, DATA, 3, +/-, then DATA.
To enter the results of a calculation as a data item, perform the calculation normally, and then press DATA when the answer is displayed.
Fixing the data entered into the calculator
• To cancel the last entry made, press C/CE before pressing DATA.
##### note:
When C/CE is pressed, “0” is displayed.
• Press INV, then n to display the number of data elements stored in the calculator. To delete a data item that was previously entered, enter the value again, then press INV, then DEL.
Using statistical functions on the data
Once a list of data values is entered the following statistical functions can be used.
 Keys Description Press INV, then n To display the number of data elements entered. Press INV, then STDV To display the sample standard deviation. Pressing INV, then PSTDV To display the population standard deviation. Pressing INV, then xy To display the arithmetic mean. Pressing INV, then SUMx To display the sum of each data element. Pressing INV, then SUMx2 To display the sum of the data element squared.
Example of finding the standard deviation
Find the standard deviation of the data 5, 9, 13, and 6.
 Keys Display Press MODE, SD, 5, DATA, 9, DATA, 13, DATA, 6, DATA, INV, then STDV SD3.593976442

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