Casio fx-50F User Manual page 45

A REG Mode Statistical Command Reference
Sum and Number of Sample Command (S-SUM Menu)
x
2
Obtains the sum of squares of the sample
x
-data.
Σ x
x
Obtains the sum of the sample
Σ x
n
Obtains the number of samples.
n
= (number of
y 2
Obtains the sum of squares of the sample
y
-data.
Σ y
y
Obtains the sum of the sample
Σ y
Mean and Standard Deviation Commands (VAR Menu)
¯ x 2 (S-VAR) 1 (VAR) 1
Obtains the mean of the sample
1 (S-SUM) 1
Σ x
2 2
=
i
1 (S-SUM) 2
x
-data.
Σ x
=
i
1 (S-SUM) 3
x
-data items)
1 (S-SUM) 1
Σ y
2 2
=
i
1 (S-SUM) 2
y
-data.
Σ y
=
i
x
-data.
Σ Σ
x x
i i
= =
n n
2 (S-VAR) 1 (VAR)
1
* This is one example of possible calculation results.
xy
Obtains the sum of products of the sample
x
-data and
x y
2
Obtains the sum of squares of the sample
x
-data multiplied by the sample
x
3
Obtains the sum of cubes of the sample
x
-data.
x
4
Obtains the sum of the fourth power of the
x
sample -data.
x σ
n
Obtains the population standard deviation
of the sample
E-44
σn σn
y y y y
1 2 1 2
y y
1 (S-SUM)
y
-data.
Σ xy Σ x
y
=
i i
1 (S-SUM)
Σ x Σ x
2 2
y y
=
i i
1 (S-SUM)
Σ x Σ x
3 3
=
i
1 (S-SUM)
Σ x Σ x
4 4
=
i
2 (S-VAR) 1 (VAR) 2
x
-data.
Σ (x Σ (x
– ) – )
σ σ
x x = = i i
n n
n n
σn σn
y y
–1 –1
3 3
14 14
3
1
y
-data.
2
3
2 2