**Thetestfor comparing Stddev's is theF-ratio MTB >NameC13"F-ratio'
MTB >LetC13= C12 * C12/(C10 * C10) MTB >PrintC13
F-ratio
0.408410
Now, wetry anovatheconventional way:

(S1²/S2²)

MTB >

Aovoneway C2-C4

Analysis ofvariance SourceDF
Factor2
Error72
Total74

SS
103 9076 9179

MS
51 126

F 0.41

Individual 95pctCi's formeanbasedonpooledStdev

----------+--------+--------+------
(------------*------------)
(------------*------------)
(------------*------------)
----------+--------+--------+------
48.051.254.4

Level
Subgp1 Subgp2 Subgp3

N 25 25 25

Mean 49.48 49.35 51.90

Stdev 10.36 13.18
9.86

PooledStdev = 11.23

MTB > MTB >

Note Note

F-ratiois .41
PooledStdev = 11.23

S-pooled

11.2276