The post addresses several questions
- 1-Var statistics and standard variations
- 2-Var stats (calculating the statistical values)
- Regressions (linear or otherwise)
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.
REGRESSIONS
To use the regression a+bx,
1. Select STAT mode : [MODE][3:STat] [ENTER][2:a+bx]
2. Fill the X and Y values in the template.
3. Press [SHIFT][STAT][7:Reg]
You have several options 1:A to get coefficient A, 2: B to get coefficient B, 3:r etc.
To access each one, you have to press [SHIFT][STAT][7:Reg] anew.
To access the various sums, you press [SHIFT]{STAT][4:Sum] and you can select Signa_x, Sigma_x^2, etc..
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