Sample size calculation
However, only a total of 30 goats are available for all the 3 groups. So what can we do? The analysis of the first two batches suggested that there was no difference between diets C and B in terms of average milk yield. In other words, fluctuating supplementation levels of calliandra appeared to have no negative effect on milk yield.
Analysis of variance (adjusted for covariate)
Source
|
d.f.
|
s.s.
|
m.s.
|
v.r.
|
F pr.
|
Batch stratum
|
Covariate
|
1
|
32310
|
32310
|
|
|
Batch.*Units* stratum
|
Diet60
|
2
|
4313
|
2157
|
1.30
|
0.305
|
Covariate
|
1
|
85893
|
85893
|
51.95
|
<.001
|
Residual
|
13
|
21492
|
1653
|
4.64
|
|
Total
|
17
|
154607
|
|
|
|
|
|
|
|
|
|
Grand mean
|
198.0
|
|
|
|
|
Diet60
|
C
|
A+B
|
B
|
|
|
|
188.4
|
219.9
|
185.7
|
|
|
rep.
|
6
|
|
|
|
|
d.f.
|
13
|
|
|
|
|
s.e.d.
|
23.92
|
|
|
|
|
|