CITIZEN SR-135FRD - Manual (Page 10)

SR135_English_090326.rtf SIZE : 140x75mm SCALE 2:1
2011/12/29
- E9 -
e. (R→P Conversion)
([x, y] → [r,θ])
f. (P→R Conversion)
([r,θ] → [x, y])
Key operation Display Key operation Display
x x θ θ
a x b θ
y y r r
b y a r
R→P
r
P→R
x
b θ b y
(23) Statistical calculation mode ([SHIFT]
[ ] ON/C
SD
).
a. When you calculate the calculation of statistics, pressing
[SHIFT] [ ]
ON/C
SD
keys for statistics mode ("SD" sign ).
When you clear to statistics mode, press the same keys
([SHIFT]
[ ] ON/C
SD
).
b. You can't perform the memory calculation, parenthesis
calculation or conversion of coordinates.
c. [DATA] : Data entry key. [DEL] : Data clear key.
d. You can calculate the following statistical volume in this
calculator.
1. n : Number of data (Number of sample).
2. Σx : Total of datum.
3. Σx 2 : Total of square of each data.
4.
x : Average of datum.
5. σ
n–1
: The sample standard deviation of the data.
6. σ
n
: The population standard deviation of the data.
n
x
n
xi
x
n
i
Σ
= =
∑
=1
1
/ ) (
1
) (
2 2
1
2
1
−
Σ − Σ
=
−
−
=
∑
= −
n
n x x
n
x xi
n
i
n
σ
n
n x x
n
x xi
n
i
n
/ ) (
) (
2 2
1
2
Σ − Σ
=
−
=
∑
= σ