HP 33S Owner's Manual

16–20 Statistics Programs
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
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.
Group 1 2 3 4 5 6
x
i
5 8 13 15 22 37
f
i
17 26 37 43 73 115
Keys:
(In RPN mode)
Display: Description:
t
S

value

Prompts for the first x
i
.

HP 33S Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Silver
Digits	10 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157 x 16 x 81 mm