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Select Y
Press the open parenthesis located directly above the 8 on the keyboard.
Repeat the process described above to obtain Y
the HOME screen. Press the open parenthesis key again, the number 1
and two close parenthesis and press ENTER. You should obtain the
results shown in Figure 45 on page 151.
3.1 Quadratic Functions; Curve Fitting
EXAMPLE 11 Fitting a Quadratic Function to Data
The data in Table 2 on page 184 represent the enrollment (in millions) in
public high schools for the years 1986 – 1996.
(a) Using a graphing utility, draw a scatter diagram of the data.
(b) Find the quadratic function of best fit.
(c) Using a graphing utility, draw the quadratic function of best fit on the
scatter diagram.
Solution
(a) To draw a scatter diagram of the data, refer back to the steps provided
in Section 1.7.
(b) In Section 1.7, you found the Line of Best Fit. In this section, we find
the Quadratic Function of Best Fit.
The keystrokes are essentially the
same, but instead of selecting option
4: LinReg (ax + b), we select
option 5: QuadReg.
by pressing ENTER. Y
1
appears on your HOME screen.
1
in order to place Y
1
on
2
w
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