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Casio fx-991EX Manual

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Important: All data currently input in the Statistics Editor is deleted
whenever you exit the Statistics Mode, switch between the single-variable
and a paired-variable statistical calculation type, or change the Statistics
setting on the setup menu.
To delete a line: In the Statistics Editor, move the cursor to the line that you
want to delete and then press .
To insert a line: In the Statistics Editor, move the cursor to the location
where you want to insert the line and then perform the following key
operation: (Editor)(Insert Row).
To delete all Statistics Editor contents: In the Statistics Editor, perform
the following key operation: (Editor)(Delete All).
Displaying Statistical Values Based On Input Data
From the Statistics Editor:
(1-Variable Calc or 2-Variable Calc)
From the statistical calculation screen:
(1-Variable Calc or 2-Variable Calc)
Displaying Regression Calculation Results Based On
Input Data (Paired-Variable Data Only)
From the Statistics Editor:
(Regression Calc)
From the statistical calculation screen:
(Regression Calc)
Obtaining Statistical Values from Input Data
You can use the operations in this section to recall statistical values
assigned to variables (σ
x
, Σx
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: Σx*, Σx
2
*, Σy, Σy
2
, Σxy, Σx
3
, Σx
2
y, Σx
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
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