HP 33S Owner's Manual

11–6 Statistical Operations
File name 33s-E-Manual-1008-Publication(1st).doc Page : 386
Printed Date : 2003/10/8 Size : 13.7 x 21.2 cm
Sample Standard Deviation
Sample standard deviation is a measure of how dispersed the data values are
about the mean. standard deviation assumes the data is a sampling of a larger,
complete set of data, and is calculated using n – 1 as a divisor.

Press
º +
{

} for the standard deviation of x–values.

Press
º +
{

} for the standard deviation of y–values.
The {
σ

} and {
σ

} keys in this menu are described in the next section, "Population
Standard Deviation."
Example: Sample Standard Deviation.
Using the same process–times as in the above "mean" example, May Kitt now
wants to determine the standard deviation time (s
x
) of the process:
15.5
9.25
10.0
12.5 12.0 8.5
Calculate the standard deviation of the times. (Treat all the data as x–values.)
Keys: Display: Description:
¹ ¡
{

}

Clears the statistics registers.
15.5
/

Enters the first time.
9.25
/
10
/
12.5
/
12
/
8.5
/


Enters the remaining data; six
data points entered.
º +
{

}

σ

σ


Calculates the standard
deviation time.
Population Standard Deviation
Population standard deviation is a measure of how dispersed the data values are
about the mean. Population standard deviation assumes the data constitutes the
complete set of data, and is calculated using n as a divisor.

Press
º +
{
σ

} for the population standard deviation of the x–values.

Press
º +
{
σ

} for the population standard deviation of the y–values.

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