Analysis of Variance
Source DF
SS MS
F p
Factor
7 815.25 116.46 75.23
0.000
Error
63 97.53 1.55
Total
70 912.77
Individual 95% CIs For Mean
Based on Pooled StDev
Level
N Mean StDev
-------+---------+---------+---------
arctica
4
42.550
0.645
(--*--)
polaris
7
41.157
1.118
(-*-)
richard
6
40.717
1.813
(--*-)
nfld
25 40.016
1.443
(*)
bangsi
10
39.430
0.769
(-*-)
cicogn
9 35.689
1.313
(-*-)
olympica 5
31.820 0.719 (--*-)
muricus 5
30.620 0.540 (--*-)
-------+---------+---------+---------
Pooled StDev = 1.244
32.0 36.0 40.0
ANOVA of latitudinal variation in skull
size of weasels (Mustela erminea)
An Analysis of variance (ANOVA)
can be used to examine differences in the mean
size of the skull in different weasel subspecies. The ANOVA simplifies
to an F-test, in which F is
the ratio of the explained (factor) to the unexplained (error)
mean square (MS). The result is highly significant
(p
<< 0.01): more northerly subspecies (including Newfoundland
weasels) have significantly larger skulls than more southerly subspecies.
Text material © 2005 by Steven M. Carr