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
(-*-)
richardsoni 6
40.717
1.813
(--*-)
nfld
25
40.016
1.443
(*)
bangsi
10
39.430
0.769
(-*-)
cicognathi 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 weasels
from the island of Newfoundland) have significantly larger skulls than
more southerly subspecies.