In a follow-up study, the veterinarian asked dog owners what type of food they fed their pets. She grouped the dogs' weights according to the types of foods their owners said they ate. She found that dogs who ate canned food weighed about 10% more than those who ate dry food. Can the veterinarian conclude that canned food causes obesity in dogs?
a. yes, because she collected data in an orderly way
b. no, because the type of study she did can't be used to identify cause-effect relationships
c. yes, because canned food probably has more fat than dry food does.
d. no, because she didn't publish her results in a scientific journal.
Ans: b. no, because the type of study she did can't be used to identify cause-effect relationships
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