HP 33S Owner's Manual

11–8 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
L.R. (Linear Regression) Menu
Menu Key Description
{

ˆ
} Estimates (predicts) x for a given hypothetical value of y,
based on the line calculated to fit the data.
{

ˆ
} Estimates (predicts) y for a given hypothetical value of x,
based on the line calculated to fit the data.
{

} Correlation coefficient for the (x, y) data. The correlation
coefficient is a number in the range –1 through +1 that
measures how closely the calculated line fits the data.
{

} Slope of the calculated line.
{

} y–intercept of the calculated line.

To find an estimated value for x (or y), key in a given hypothetical value for y
(or x), then press
º %
{

ˆ
} (or
º %
{

ˆ
}).

To find the values that define the line that best fits your data, press
º %
followed by {

}, {

}, or {

}.
Example: Curve Fitting.
The yield of a new variety of rice depends on its rate of fertilization with nitrogen.
For the following data, determine the linear relationship: the correlation coefficient,
the slope, and the y–intercept.
X, Nitrogen Applied
(kg per hectare)
0.00 20.00 40.00 60.00 80.00
Y, Grain Yield
(metric tons per hectare)
4.63 5.78 6.61 7.21 7.78
Keys: Display: Description:
¹ ¡
{

}

Clears all, previous statistical
data.
4.63
Ï
0
/
5.78
Ï
20
/


Enters data; displays n.



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