(a) Identify any treatment factors for which randomization cannot be performed Table 7.12 Percentage of the predation of seeds of three species at different levels of three experimental variables.
A B C D E F 1 distance block residue cage_type species %pred 2 0 1 2 1 wo 100.0 3 0 1 2 2 wo 95.0 4 0 1 2 3 wo 30.0 5 0 1 2 4 wo 10.0 6 0 1 1 1 wo 95.0 7 0 1 1 2 wo 100.0 8 0 1 1 3 wo 100.0 9 0 1 1 4 wo 10.0 10 0 1 3 1 wo 100.0 11 0 1 3 2 wo 30.0 12 0 1 3 3 wo 100.0 13 0 1 3 4 wo 10.0 14 0 2 3 1 wo 10.0 15 0 2 3 2 wo 0.0 16 0 2 3 3 wo 5.0 17 0 2 3 4 wo 0.0 ⋅ ⋅
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430 100 3 3 1 arg 100.0 431 100 3 3 2 arg 12.2 432 100 3 3 3 arg 23.3 433 100 3 3 4 arg 11.1 Source: Data reproduced by kind permission of Robert Gallagher.