GMAT Verbal : Identifying Flaws of Sampling
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Example Questions
Example Question #1 : Critical Reasoning
Many of the yachts anchored in Miami boast a luxurious hot tub on the top deck. Almost 80% of the yachts that were sold in the past fifteen years in Miami are older models, and none of them had built-in hot tubs.
The information above most strongly supports which of the following?
None of the newer yacht models with hot tubs will be sold in the next fifteen years.
Some newer yacht models were sold in the past fifteen years in Miami.
All yachts in Miami without hot tubs were sold in the past fifteen years.
People shopping for yachts will likely choose an older-model with a hot tub than an older-model without a hot tub.
Only new yacht models come with hot tubs.
Some newer yacht models were sold in the past fifteen years in Miami.
The two pieces of evidence we are offered here do not allow us to make a strong enough conclusion to connect yachts to hot tubs. The first sentence tells us that an unspecified “many” of the yachts in Miami have a hot tub, but we do not know how many of these yachts are older models and how many are newer models. The second sentence tells us that 
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