Citizen SR-135T - Page 9

SR8D1A-E.RTF SIZE : 140x75mm SCALE 2:1 2003/8/22
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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
θθ
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.
Σ
x : Total of datum.
3.
Σ
x
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
xXi
n
n
σ
n
n
x
x
n
i
xXi
n
n
2
2
2
)(
1
)(
Σ
−Σ
=
=
−
Σ
=
σ