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14: Additional Examples 219
File name : English-M02-1-040308(Print).doc Print data : 2004/3/9
4040
I
3200
I
e
VOL
I
Names the list VOL.
e
(use
]
and
[
if necessary)
Displays the MAVG
equation. Make sure
name is VOL.
Displays menu.
3 Stores number of
points.
3
Calculates average for
months 1, 2, and 3.
4
Calculates average for
months 2, 3, and 4.
5
Calculates average for
months 3, 4, and 5.
6
Calculates average for
months 4, 5, and 6.
Chi-Squared ( χ
2
) Statistics
The χ
2
statistic is a measure of the goodness of fit between data and an
assumed distribution.
* It is used to test whether a set of observed
frequencies differs from a set of expected frequencies sufficiently to
reject the hypothesis under which the expected frequencies were
obtained.
* The statistic can be assumed to be χ
2
distributed with n–1 degrees of freedom
if n or some of the E
i
values are large.