FX 300 MS Training guide
Standard Deviation
Use the [MODE] key to enter the Standard Deviation (SD) mode when you want to perform
statistical calculations using standard deviation. [MODE] [2]
•
To clear statistical memory, press [SHIFT] [CLR] [1] [=].
•
To enter data, use the following key sequence: <value> [DT]
•
Input data is used to calculate the following values:
Sum of the squares (
∑
x
2
)
[SHIFT] [S-SUM] [1]
Sum of data (
∑
x)
[SHIFT] [S-SUM] [2]
Number of data items (n)
[SHIFT] [S-SUM] [3]
Mean of the data
[SHIFT] [S-VAR] [1]
Population standard deviation
σ
n
[SHIFT]
[S-VAR]
[2]
Sample standard deviation
σ
n
-1
[SHIFT]
[S-VAR]
[3]
Key points to note:
•
[DT] [DT] inputs the same data twice
•
You can input multiple entries of the same data using [SHIFT] [;].
To input 100 ten times, press [100] [SHIFT] [;] [10] [DT]
•
You can scroll through the data you entered using the up and down arrows on the
REPLAY button.
•
You can edit the displayed data by inputting a new value and then pressing the [=]
key to replace it. If you use the [DT] key (and not the [=] key), this will register the
value you input as a new data item and will leave the old value as is.
•
If you want to perform statistical calculations, always press the [AC] key first to exit
the data display.
•
To delete a data value that is displayed, press [SHIFT] [CL].
•
If you switch to another MODE, you will no longer be able to display or edit your
data.
8
References the Casio FX-300 MS User’s Guide
Casio FX-300MS Scientific calculator
