Obtaining Statistical Values from Input Data
You can use the operations in this section to recall statistical values
assigned to variables (
σ
x
,
Σ
x
2
, etc.) based on the data you input with the
Statistics Editor. You can also use the variables in calculations. The
operations in this section are performed on the statistical calculation screen
that appears when you press
while the Statistics Editor is displayed.
Supported statistical variables and the keys you should press to recall them
are shown below. For single-variable statistical calculations, the variables
marked with an asterisk (*) are available.
Summation:
Σ
x
*,
Σ
x
2
*,
Σ
y
,
Σ
y
2
,
Σ
xy
,
Σ
x
3
,
Σ
x
2
y
,
Σ
x
4
(Summation)
to
Number of Items:
n
* /
Mean:
𝑥
−
*,
𝑦
−
/
Population Variance:
σ
2
x
*,
σ
2
y
/
Population Standard Deviation:
σ
x
*,
σ
y
/
Sample Variance:
s
2
x
*, s
2
y
/
Sample Standard Deviation:
s
x
*, s
y
(Variable)
to
,
to
Minimum Value:
min(
x
)*, min(
y
) /
Maximum Value:
max(
x
)*, max(
y
)
When the single-variable statistical calculation is selected:
(Min/Max)
,
When a paired-variable statistical calculation is selected:
(Min/Max)
to
First Quartile:
Q
1
* /
Median:
Med* /
Third Quartile:
Q
3
* (For single-variable
statistical calculations only)
(Min/Max)
to
Regression Coefficients:
a
,
b
/
Correlation Coefficient:
r
/
Estimated
Values:
𝑥
,
𝑦
(Regression)
to
Regression Coefficients for Quadratic Regression:
a
,
b
,
c
/
Estimated
Values:
𝑥
1
,
𝑥
2
,
𝑦
(Regression)
to
•
𝑥
,
𝑥
1
,
𝑥
2
and
𝑦
are commands of the type that take an argument
immediately before them.
Ex 2:
To input the single-variable data
x
= {1, 2, 2, 3, 3, 3, 4, 4, 5}, using the
Freq column to specify the number of repeats for each items {
x
n
; freq
n
} =
{1;1, 2;2, 3;3, 4;2, 5;1}, and calculate the mean.
(SETUP)
(Statistics)
(On)
(Select Type)
(1-Variable)
1
2
3
4
5
1
2
3
2
(Variable)
(
𝑥
−
)
3
Ex 3:
To calculate the logarithmic regression correlation coefficients for the
following paired-variable data and determine the regression formula: (
x
,
y
) =
(20, 3150), (110, 7310), (200, 8800), (290, 9310). Specify Fix 3 (three
decimal places) for results.
(SETUP)
(Statistics)
(Off)
(SETUP)
(Number Format)
(Fix)
(Select Type)
(y=a+b
･
ln(x))
20
110
200
290
3150
7310
8800
9310
16
