Texas-instruments TI-73 EXPLORER User Manual download pdf (Page 144)

138

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 Manual-Fit -

3 3

Manual-Fit

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

Manual-Fit

from either the

Graph screen or the Home screen.

From the Graph screen, select

Manual-Fit,

and then draw the

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

y=ax+b

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,

Manual-Fit

accepts one optional

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

the

ax+b

equation that manually fits the plotted data. To access

the

variables, press

}

Manual-Fit

From either the Home screen or the Graph screen or Program

editor, select

Manual-Fit

after you have plotted the stat plot. To

draw the

Manual-Fit

line:

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

that you want to draw, and then press

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

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

the

ax+b

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

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Texas-instruments TI-73 EXPLORER User Manual Page 144

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