Texas Instruments TI-86 - Manual (Page 212)

200
Chapter 14: Statistics
14STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 200 of 14 14STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 200 of 14 14STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 200 of 14
ᕡ Enter stat data in the list editor. The screen to
the right shows all fStat elements as 1 , but you
need not enter them. 1 is the default for all
fStat elements. However, if other elements are
stored to fStat , you must clear them.
- š '
`
1 # 1 ` 1
# 2 # 4 # 5
# " 1 # 2
# 3 # 4 # 2
ᕢ Display the home screen.
ᕣ Execute a linear regression for
xStat and yStat .
The statistical results are displayed.
ᕤ Remove the STAT CALC menu to display all
results, including n .
.
- š &
( b
.
ᕥ Display the forecast editor. The current
regression model is displayed on the top line.
ᕦ Enter x=3 , and then move the cursor to the y=
prompt.
/ &
3 #
ᕧ Select SOLVE from the forecast editor menu to
solve for y at x=3 . A small square indicates the
solution. You can continue to use the forecast
editor with other values for
x or y .
*
When you use FCST , the values of x , y , and Ans are not updated. To store the x value or
y value, move the cursor onto the variable to be stored, press X, enter a valid variable
name at the Sto prompt, and then press b.
Values entered at forecast
editor prompts must be real
numbers or expressions that
evaluate to real numbers.
If the most recent calculation
was a polynomial regression,
you can only forecast the y
value.