Twenty dogs and 20 cats were subjects in an experiment to test the effectiveness of a new flea control chemical.
Ten of the dogs were randomly assigned to an experimental group that wore a collar containing the chemical, while the others wore a similar collar without the chemical. The same was done with the cats. After 30 days veterinarians were asked to inspect the animals for fleas and evidence of flea bites. This experiment is
A) randomized block, blocked by species
B) completely randomized with one factor: the type of collar
C) completely randomized with two factors
D) completely randomized with one factor: the species of animal
E) randomized block, blocked by type of collar
Question 2
An appliance store sells both new and used appliances. Fifty percent of the stock is used. Fifty-two percent is used or defective. If 9 of the store's stock is defective, what percentage is both used and defective?
A) 7 B) 11 C) 93 D) 0.07
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