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sigma =

5.1128e-001

degree of polynomial = 2

coeff =

-4.1971e-002

2.1512e+000

-8.5701e+000

sigma =

3.1099e-001

degree of polynomial = 3

coeff =

-2.9852e-003

2.8845e-003

1.9810e+000

-8.4660e+000

sigma =

3.1948e-001

degree of polynomial =

Done

041971
x
2

5701produces the

smallest standard deviation, itcan beconsideredas the “best”fittothedata. But be

warned—the standarddeviationis not an infalliblemeasureofthegoodness-of-fit. It is

always agoodidea to plot the datapoints and
f
(
x
) before final determinationismade.

The plot of our data indicates that the quadratic (solid line) is indeedareasonable

choice for the fitting function.

Because

the

quadratic

f
(
x
)

=−

0

.

+

2

.

1512
x

−

8

.

10.0

5.0

0.0

-5.0

-10.0

-2.0

0.0

2.0

4.0

6.0

8.0

10.0

12.0

x

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