Hp 33s User Manual Page 280

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16–20 Statistics Programs
Program Instructions:
1.
Key in the program routines; press
when done.
2. Press
X
S to start entering new data.
3. Key in x
i
–value (data point) and press
g
.
4. Key in f
i
–value (frequency) and press
g
.
5. Press
g
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
g
in step 4, press
X
U and then press
g
again. Then go
back to step 3 to enter the correct data.
7. When the last data pair has been input, press
X
G to calculate and
display the grouped standard deviation.
8. Press
g
to display the weighted mean of the grouped data.
9. To add additional data points, press
g
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.
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