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• Example:
Perform quadratic regression to de-
termine the regression formula terms
and correlation coefficient for the data
nearby. Next, use the regression for-
mula to estimate the values for
ˆy (es-
timated value of
y) for xi = 16 and ˆx
(estimated value of x) for yi = 20.
Enter REG mode (Quadratic regression)
fx-85W:
F F 2 r 3
Other models: q 3 r 3
A m =
29 P1.6 S 50 P 23.5 S
74 P 38.0 S103 P 46.4 S
118 P 48.0 S
118.
REG
(Regression Coefficient A) A q =
-
35.59856934
(Regression Coefficient B) A w =
1.495939413
(Regression Coefficient C) A e =
-
6.71629667
-
0
3
(ˆy when xi = 16) 16 A b
-
13.38291067
(ˆx
1
when yi = 20) 20 A O
47.14556728
(ˆx
2
when yi = 20) A O
175.5872105
Data Input Precautions
• S S inputs the same data twice.
•You can also input multiple entries of the same data us-
ing
A G. To input the data “20 and 30” five times, for
example, press 20
P 30 A G 5 S.
• The above results can be obtained in any order, and not
necessarily that shown above.
•To delete data you have just input, press
A U.
x
i
y
i
29 1.6
50 23.5
74 38.0
103 46.4
118 48.0