63 LR One Question 23
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Hi Dave,
I need some help on this one please. I chose answer A and was also attracted to answer C:
A because it would show that they weren't really influenced.
C because it had the sampling error language, but it didn't make sense.
Can you please tell me why both are wrong and how B correctly outlines the sampling error?

Our structural indicators for flaw answer choices should help you eliminate (A)—in order to prove a claim about the number of makes of car by region, the author doesn't need to make any estimate about the composition of the study. She needed to show that the study was in fact representative, but that doesn't entail estimating the likely knowledge base of participants.
You're right about (C)—it should attract you initially for its clear sampling language, and then you should eliminate it on consideration because it doesn't make sense. Good work.
(B) points out that a sample is never sufficient for proof. Even if we were to accept that the sample was representative, that fact could only support our argument, not prove our conclusion! It's really speaking directly to the "must" in the conclusion, and could apply to all sorts of other errors as well as the sampling error found here.