Standard Deviation-Mean Plot
Section	Mean	Standard Deviation	Range
1	156.25	1.70782512765993	4
2	152.25	1.25830573921179	3
3	156	1.41421356237310	3
4	148.5	6.75771164423776	15
5	142.25	2.21735578260835	5
6	141.5	2.08166599946613	5
7	129.25	9.14239210126832	19
8	125	2.94392028877595	6
9	128.25	0.5	1
10	116	7.61577310586391	15
11	107	2.44948974278318	6
12	117.75	3.30403793359983	8
13	108	4.96655480858378	11
14	106.25	2.62995563967658	6
15	108.5	2.38047614284762	5
16	109.5	10.0829889748361	23
17	123.75	3.09569593683445	7
18	127.75	4.19324854180304	9
19	118.5	7.04745817062199	17
20	123.25	7.13559154286922	16
21	117	8.52447456836295	20

Regression: S.E.(k) = alpha + beta * Mean(k)
alpha	12.3096865939571
beta	-0.062743392720682
S.D.	0.0376966620166795
T-STAT	-1.66442834362682
p-value	0.112432037552735

Regression: ln S.E.(k) = alpha + beta * ln Mean(k)
alpha	12.7019989294224
beta	-2.37472256156021
S.D.	1.28169666173510
T-STAT	-1.85279608854206
p-value	0.0795100932997238
Lambda	3.37472256156021