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55
Using Calculation Modes
Statistical Calculations (SD, REG)
Standard Deviation (SD)
Use the key to enter the SD Mode when you want to perform
statistical calculations using standard deviation.
(SD)
• In the SD Mode and REG Mode, the key operates as the key.
• Always start data input with (CLR) (Scl) to clear
statistical memory
.
• Input data using the key sequence shown below.
< x -data>
• Input data is used to calculate values for n , Σ x , Σ x
2
, x
-
, σ
n
and s
x
,
which you can recall using the key operations noted nearby
.
To recall this type of value: Perform this key operation:
Σ x
2
(S-SUM) (Σ x
2
)
Σ x (S-SUM) (Σ x )
n (S-SUM) (n )
x
-
(S-VAR) ( x
-
)
σ
x
(S-VAR) ( σ
x
)
s
x
(S-VAR) (s
x
)
Example: T
o calculate s
x
, σ
x
, x
-
, n , Σ x , and Σ x
2
for the following data :
55, 54, 51, 55, 53, 53, 54, 52
In the SD Mode:
(CLR) (Scl) (Stat clear)
Each time you press to register your input, the number of data input up
to that point is indicated on the display ( n value).
54
51 55 53 54 52
30
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