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.
Enter the first number, 1. Hit the σ+ (Sigma+) key. ( n=1 will appear in the window) Enter the second number, 1. Hit the σ+ (Sigma+) key. (n=2 will appear in the window) . . . . . Enter the last number, 7. Hit the σ+ (Sigma+) key. (n=7 will appear in the window) Hit 2nd x2 (by hitting the 2nd key you are actually selecting the x-bar written above the key.) This gives you the mean. Hit 2nd sqrt(x). This gives you the sample standard deviation which we will use in class. Make sure you turn your calculator off and on for new data sets.
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