Texas Instruments TI-73 Benutzerhandbuch

Chapter 7: Statistical Analyses     

7307ENG.DOC   CH 7, Statistical Analyses, English   Julie Hewlett   Revised: 07/29/98 12:07 PM   Printed: 05/19/99

9:00 AM   Page 137 of 22

Variables

Definition

VARS Menu

Correlation coefficient

Coefficient of determination

Regression equation

Summary points

Regressionà fit coefficients

 

=number of 

 data points in a 

 analysis or the

number of 

 and 

 data points in a 

 analysis. Since

both variable lists always have the same number of list

elements in 

, 

 for 

 is always equal to 

 for 

.

Therefore, 

 applies to both the 

 and 

 analyses.

 

If freq is specified, 

 is equal to the sum of the elements in that

list. For example, if the freq is {2,2,3,1,2}, 

={2+2+3+1+2}=10.

 

 

 

 

 

, 

, and 

 are undefined if the freq contains non-integer

values. They also are not calculated if the freq contains a value

larger than 99.

 

The calculator stores the most recently generated regression

equation (see - v 

 menu items 3–7) to the variable,

. If, for example, you execute 

, but you

don’t initially store 

 to a 

 variable, you can later insert

 into the Y= editor. The calculator graphs the regression

equation when it is selected.
If the frequency for an element or data pair is 0, the element or

data pair is ignored in the calculation.