Texas Instruments TI-73 EXPLORER 用户手册

     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 138 of 22

 

Manual-Fit   -

 

  v

 

  !

 

 allows you to fit a line to plotted data on the Graph

screen manually (as opposed to the calculator automatically

drawing it for you). You can execute 

 from either the

Graph screen or the Home screen.
From the Graph screen, select 

 and then draw the

line (steps provided below). The linear equation in the form

 is shown at the top of the Graph screen. You can use

the cursors to adjust the line, if necessary, and the 

 and 

equation values change accordingly.
From the Home screen, 

 accepts one optional

argument, Yn. The calculator stores to Yn (in the Y= editor)

the 

 equation that manually fits the plotted data. To access

the 

 variables, press - } 

.

Yn

From either the Home screen or the Graph screen or Program

editor, select 

 after you have plotted the stat plot. To

draw the 

 line:

1. Position the cursor at the beginning of the line segment

that you want to draw, and then press b.

2. As you press the cursor keys, the line is drawn and the

slope is adjusted. When you have matched the plotted

points as desired, press b.

3. The line segment is drawn across the entire screen and

the 

 equation is shown at the top of the Graph screen.

4. Continue to adjust the line’s slope with $ and #, and the

y-intercept with ! and ", if desired.

5. If you specified a 

 variable on the Home screen, you can

view the selected and defined equation in the Y= editor

(&). If you no longer want to view the Manual-Fit line,

deselect it in the Y= editor by highlighting the 

 and

pressing b.