HP 17bII+ - Manual (Page 219)

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.