HP 33S User Manual

11–4 Statistical Operations
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
Statistical Calculations
Once you have entered your data, you can use the functions in the statistics menus.
Statistics Menus
Menu Key Description
L.R.
º %
The linear–regression menu: linear
estimation {

ˆ
} {

ˆ
} and curve–fitting {

} {

}
{

}. See ''Linear Regression'' later in this
chapter.
x
,
y
º (
The mean menu: {

} {

} {

}. See
"Mean" below.
s,
σ
º +
The standard–deviation menu: {

} {

}
{
σ

} {
σ

}. See "Sample Standard
Deviation" and "Population Standard
Deviation" later in this chapter.
SUMS
º .
The summation menu: {

} {

} {

} {


}
{


} {

}. See "Summation Statistics"
later in this chapter.
Mean
Mean is the arithmetic average of a group of numbers.

Press
º (
{

} for the mean of the x–values.

Press
º (
{

} for the mean of the y–values.

Press
º (
{

} for the weighted mean of the x–values using the
y–values as weights or frequencies. The weights can be integers or
non–integers.
Example: Mean (One Variable).
Production supervisor May Kitt wants to determine the average time that a certain
process takes. She randomly picks six people, observes each one as he or she
carries out the process, and records the time required (in minutes):

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