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I have a very old scientific calculator (about 15 yrs old), EC 4031 brand is Tandy AKA Radioshack. desperately need to know how to use standard deviation and mean, for statistics. PLEASE HELP ME
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Posted on Jan 02, 2017
SOURCE: 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
7.Press 2 to calculate the mean
Posted on Sep 19, 2009
SOURCE: can you please help me
This will show you how to do statistics (calculate average, standard deviation, regressions etc.) as to the mode and median refer to the definitions.
TO COMPUTE STANDARD DEVIATION AND 2-VAR STATISTICS.
I assume you know the theory. I will show you the key strokes
For 1-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 the statistical value 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.
For 2-var statistics
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.
Posted on Apr 21, 2011
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