Table 3. Analysis of variance.
Classification
Soil hardness
N
Avg
z
(kgf/cm
2
)
SD
F
p
Line 1
229
21.44
b
9.64
12.07
<0.001
Line 2
295
20.20
a
9.51
Groundwater line
299
22.90
c
12.60
Normal site
148
26.23
d
12.76
Scheffe test, a < b < c < d