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16–20 Statistics Programs
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Program Instructions:
1. Key in the program routines; press
Å
when done.
2. Press
t
S to start entering new data.
3. Key in x
i
–value (data point) and press
¥
.
4. Key in f
i
–value (frequency) and press
¥
.
5. Press
¥
after VIEWing the number of points entered.
6. Repeat steps 3 through 5 for each data point.
If you discover that you have made a data-entry error (
x
i
or f
i
) after you have
pressed
¥
in step 4, press
t
U and then press
¥
again. Then go
back to step 3 to enter the correct data.
7. When the last data pair has been input, press
t
G to calculate and
display the grouped standard deviation.
8. Press
¥
to display the weighted mean of the grouped data.
9. To add additional data points, press
¥
and continue at step 3.
To start a new problem, start at step 2.
Variables Used:
X Data point.
F Data–point frequency.
N Data–pair counter.
S Grouped standard deviation.
M Weighted mean.
i Index variable used to indirectly address the correct
statistics register.
Register 28 Summation
Σ
f
i
.
Register 29 Summation
Σ
x
i
f
i
.
Register 31 Summation
Σ
x
i
2
f
i
.
Example:
Enter the following data and calculate the grouped standard deviation.