Bunuel
Bank customers today expect excellent service - shorter lines, cordial service providers, online access to accounts, etc. Each advance in the quality of service further raises customer expectations. Any bank which is satisfied with its current quality of service will soon find that its customers are not. Bank4U has recently announced that meeting or exceeding customer expectations is its goal.
Which of the following can properly be inferred from the statement above?
A. Bank4U was among the first banks to introduce online services.
B. Bank4U's goal will be met only if it continuously improves its quality of service.
C. Bank4U's customers are currently satisfied with its quality of service.
D. Bank2B will attract more customers if it also adopts Bank4U's goal.
E. If a bank is satisfied with its quality of service, the quality of service is more likely to decline.
Gotta be careful with non-Official material. Fortunately, this was posted by Bunuel, who knows his stuff.
GMAT CR features two (not one) types of Inference questions, just like the LSAT. Quoting the writers of the LSAT regarding the two types (unfortunately, GMAT writers don’t have anything remotely similar):
1. “Some questions test or ability to identify what follows logically from certain evidence or information. For these questions you will be presented with information that provides conclusive support for one of the answer choices.”
2. “Some questions ask you to identify a position that is supported by a body of evidence, but not supported conclusively.”
Why does this matter? Because the first type represents deductive reasoning (evidence leading to a conclusion that must be true), meaning that the correct answer will never introduce information not already contained in the stimulus. The second type represents inductive reasoning (evidence leading to a conclusion that is probably true), meaning that the correct answer can introduce information not already container the stimulus, so long as such information is directly related.
How to tell the difference between the two? Inductively reasoned inference question types will use the word “most” in the stem. For example, “most strongly supports” or “most strongly supported by”.
Deductively reasoned inference question types will NOT use the word “most”. Typically these questions will ask “which of the following must be true” and more rarely, will use phrases such as “properly inferred” - like Bunuel’s post.
Note how the four wrong answers all introduce information not contained in the stimulus. Only one answer (B) does not do so, making it the correct answer.
Not trying to make trouble, but a lot of folks in GMAT/LSAT prep are unaware of the difference between these two Inference question types. While the difference conceptually is minimal, the type of logic being tested between the two is significantly different. The result is that one Inference p question type does not allow outside information in the correct answer while the other type does allow such outside information.
Official material will always be consistent with the assertions above. Cannot say the same for non-official material. Although as previously indicated, Bunuel knows his stuff.
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