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 142 of 22

5. View the line on the Graph

screen.

(

6. View the equation stored to

, if desired.

&

 

LinReg(ax+b)   -

 

  v

 

  !

 

 (linear regression) fits the model equation 

to the data using a least-squares fit. It displays the value for 

(slope) and 

 (y-intercept); when 

 is set, it also

displays values for 

 (coefficient of determination) and 

(correlation coefficient). The 

 command is in the

 (-|).You can execute 

 from the

Graph screen, Home screen, or the Program editor.
It is also helpful to compare the slope of the line you draw

with 

 to the slope of the line the calculator calculates

with the 

 command.

From the Home screen or the Program editor, 

accepts four optional arguments. Enter up to two list names,

XList and YList; a frequency list, freq; and an equation

variable, Yn. freq is the frequency of occurrence for each

corresponding data point in XList and YList. If freq is omitted,

all values are used once. If XList and YList are not specified,

the default list names are 

 and 

. To access 

 variables,

press - } 

.

[XList,YList,freq,Yn]

The Med-Med

line

The Manual-Fit line,

 (previous section).

 and Y

may vary.