CITIZEN SR-135T - Manual (Page 9)

SR8D1A-E.RTF SIZE : 140x75mm SCALE 2:1 2003/8/22
- E9 -
e. (RÆP Conversion)
([x, y]Æ[r, θ])
f. (PÆR Conversion)
([r, θ]Æ[x, y])
Key operation Display Key operation Display
x x θ θ
a x b θ
y y r r
b y a r
RÆP r PÆR 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
i
Xi
n
x
Σ
=
=
Σ
=
1
1
) (
1
1
) (
1
2
2
2
−
Σ
− Σ
=
−
=
−
Σ
= −
n
n
x
x
n
i
x Xi
n
n σ
n
n
x
x
n
i
x Xi
n
n
2
2
2 ) (
1
) (
Σ
− Σ
=
=
−
Σ
= σ