HP 20B - Manual (Page 64)

Statistical Operations
64
Table 10-3 Statistics Example
Keys Display Description
5I1
70I Inputs values for X(5) and Y(5).
:z Opens Stats menu.
Opens Descriptive sub-menu.
<< Displays average y.
:z<<
I Opens Predictions sub-menu. Note: this example
performs calculations based on a linear
(a*X+b)
regression line.
<7I Inputs 7 as the Prediction X value (month 7).
<= Calculates Prediction Y value (sales at month 7).
< Displays value for a: the slope of the regression
line.
< Displays current value for b: the y-intercept of the
regression line.
< Displays value for Correlation.
:z<<
Opens Sums sub-menu. Displays the sum of all y
values (Sigma Y).
To reset the menu items to their default values, with any item of the Data or Statistics menus displayed press
:x
. At
the prompt, Stats , press
I
. Confirm your choice by pressing
I
.