Casio fx-4200P

4
11/Performing Statistical Calculations
For statistics, you have a choice of the SD mode for standard deviation calculations, and
the LR mode for regression calculations.
@ Performing Standard Deviation Calculations
in the SD mode (feo)(3}), you can calculate paired two types of standard deviation, mean,
number of data, the sum of data, the sum of squares of data.
*Data Input
@ Press ()(3} to enter the SD mode.
@Press [ii]d to clear the statistical memories.
@Enter each data item, using the following sequence: DATA 7).
Data: 10,20, 30
Procedure: 10(07)20(61) 3067)
*You can enter identical data items by pressing the (6%) key repeatedly, or by specifying
the number of data that are the same.
Data: 10, 20, 20, 30
Procedure: 101) 206767) 30 7)
Each time you press (03) without entering a new data item, the previously entered data
item (here, 20) is entered again.
[Example 2]
Data: 10, 20, 20, 20, 20, 20, 20, 30
Procedure: 1067) 20 Gi) (7) 6 67) 30 6)
The value which you entered after the semicolon (here, 6) tells the calculator how many
times to repeat the previously entered data item (here, 20).
*Deleting Entered Data
40 (07) 20 (67) 30 (07) 50 (oF
To delete 50 (61): G4 ED
40 67) 20 (67) 30 [07] 50 7)
To delete 20 (BT): 20 Gy ey)
Example 3
30(57)}50 07) 120)
To clear 120 &():
30 67)50 7) 120 Ba F)31
To clear 120 Ge]G131: 09
30 67}50 GF) 120 &] E31 GF}
To clear 120 &)(2)31 07): fe)
5001 120fAG
To clear 120&
31 (1) 40 67) 30 F)
3167: 120GFIG) 31 GARED
7]
*Calculations
The following table shows the results produced by each key operation:
Key Operation Result
(Sar oR) ee) Population standard deviation xon
(on) (Exe) | Sample standard deviation vo» 1
Mean
Sum of squares of data
Sum of data
SHHRSRA
fi
ASAOew
Number of data items
*The following formulas are used for standard deviation:
its
(xy -¥) Dx?-(Lx)'In
0n= =
n n
(For calculation of population standard deviation using all data for a finite population.)
L(x-¥/ Lx? —(Lx)Pn
n-1 7” n-1
On-1 =
(For estimation of sampie standard deviation for an entire population using a sample from the population.)
Mean formula
_ =x. Ex
X=-e=—
n fn