bsv180985 wrote:
A dog enthusiast took home two puppies from the dog shelter. He fed one of the puppies super-premium canned dog food, while he fed the other a generic brand from the grocery store. The dog fed on the generic brand gained weight twice as fast as the dog fed the super-premium brand. Because of the difference in these results, the dog enthusiast concluded that the generic brand actually provided nutrition superior to that of the super-premium brand.
Each of the following, if true, would weaken the evidence for the dog enthusiast's conclusion except for which of the following?
A. A dog will sometimes gain more weight when eating inferior-quality food because he must eat more of it to obtain the nutrients he needs.
B. The dogs were of mixed breeds and appeared to be descended from dogs of different sizes.
C. Both dogs ate all the food given to them at each serving.
D. The dog enthusiast did not give the two dogs equal amounts of their respective foods.
E. The dog who received the super-premium dog food suffered from a digestive system disorder that hindered his groeth.
I'd like to see your approach, guys
Conclusion: the generic brand actually provided nutrition superior to that of the super-premium brand.
A. A dog will sometimes gain more weight when eating inferior-quality food because he must eat more of it to obtain the nutrients he needs.
=> so because the dog eats generic food had to eat a higher amount of food, its weight increased higher. It is not because generic food provided higher nutrition => Provide another reason which attacked the conclusion
B. The dogs were of mixed breeds and appeared to be descended from dogs of different sizes.
=> Provide another reason which attacked the conclusion
C. Both dogs ate all the food given to them at each serving.=>
Correct choiceD. The dog enthusiast did not give the two dogs equal amounts of their respective foods.
=> For example, if the dog fed on generic brand food was given a higher amount of food than that of the đo fed on super-premium brand, its weight can be higher
E. The dog who received the super-premium dog food suffered from a digestive system disorder that hindered his growth.
=> It is because of the digestive system which caused the lower weight of dog fed on super-premium brand, so it cant be said that the generic brand provided higher nutrition - Provide another reason which attacked the conclusion