I know to get SD you must minus the mean from the point to get distance from mean and eventually mean, but with 50 data points this is going to take forever...
Here is one technique I used on the TI84Plus.
Create two lists list1(50) and list2(50) of equal dimension (same length)
You will have to find how to do it on ClassPad.
Fill list2 with zeros
Fill list1 with your data.
Sort the list in ascending order (if it is not sorted)
Do standard deviation calculation on list1 (or calculate the average)
The mean of the data is in a special variable (xbar)
From the command line using the list syntax calculate abs(list1-xbar) and store results in list2, overwiting the zeros.
Perform standard deviation on the new list2. You will get the mean deviation from the mean in the variable xbar.
A simple request from you. Can you please not use MINUS as a verb? By doing so you are propagating incorrect usage. There is a short and correct way to express the operation: to add.
SOURCE: standard deviation
standard deviation
calculate mean of a data set:
1. Turn calc. on or press MODE SeTUP
2.Press 3 for STAT
3. Press 1 for VAR
4.Enter values for X column
5. WHen done entering press SHIFT 1
6.Press 5
7.Press 2 to calculate the mean
8.Press =
SOURCE: Trying to find standard deviation on the calculator
I took statistics last semester and I don't really remember how, but after you enter your data, you press SHIFT, then STAT (on the 1 key), then I think it's under 5 (VAR), and maybe Xon-1? Eh, funny how long you remember this stuff for....
SOURCE: Calculate Variance on Casio FX-83ES Calculator
Hello,
I am happy that you found my solution helpful and even flattered that you copied it in this thread. By doing this, you gave me the opportunity to discover an error in my post. In fact, the calculator does provide a column for the frequency. If you enter nothing in the frequency column, all data items will have their frequency set to 1, by default.
Back to the current subject: How to get the variance (the square of the standard deviation).
When you finish entering your data:
If you are not interested in the value of the standard deviation, but just want the variance, follow the foregoing procedure until step #5.
While the symbol xSigma_n or xSigma_n-1 is still displayed with the blinking cursor to its right, press the [x^2] key above the [HYP] key. The screen displays say xSigma_n ^2. Press [=] to calculate the variance.
As my motto says, I am always happy to help, but happier still when people show true appreciation.
Hope it helps.
SOURCE: FX-115ES Scientific Calculator: how to do standard deviation...
I assume you know the theory. I will show you the key strokes for
1-Var statistics and 2-Var statistics
Press [MODE][3:STAT] [1:1-VAR].
You are ready to
enter values in the X column.
Enter a number and press [=]. Cursor
jumps to second number to enter.
Keep entering numbers and pressing
[=] till all numbers are in. Press the [=] key after the last one.
Press
[AC] key to clear the screen.
Press
[SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the
statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.
Press
the
number corresponding to Referable you want, ex 1:n . The
variable appears on screen. Press [=] and it will be displayed.
To
display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .
- To access the sum of squares sigma x^2 and the sum of data sigma x
press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x].
Press [SHIFT][STAT][6:MinMax] to access minX and maxX.
To
perform 2 variable statistics you press [MODE][3:STAT] and any of the
other regression options (except 1:1-Var). A two column template opens
where you enter the X and Y values. When finished entering data, press
[SHIFT][STAT][5:Var]. to access the different statistics. As I assumed
above, you should be able to
recognize what each variable means.
SOURCE: How do i perform standard
Turn ClassPad ON.
Press [MENU]
Find the STATISTICS application and tap its icon.
Enter your data in one column (L1) and frequency values in List 2.
If all frequencies are equal to 1, no need to enter them in L2.
After you finish entering the data, Tap the CALC menu at the top of screen.
Select One-Variable (or two variables if you want regressions) and tap the OK button. You are given the opportunity to select the data list and the frequency list, if any.
Validate your choices. and tap OK.
Statistical values are displayed. The display runs more than one screen. Use the downArrow to scroll.
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