hard · GRE Verbal
A coffee shop redesigned its menu board to display suggested tip percentages, and average tips rose the next month. The owner calls this "proof that suggested percentages increase tipping," though the shop also switched to a new point-of-sale system that defaults to a higher suggested tip than the old system did. Which choice most accurately states the passage's primary purpose?
- To present an owner's causal claim and note a concurrent change that complicates attributing the result to the menu redesign alone
- To prove that suggested tip percentages never influence customer behavior in any setting
- To report only that average tips changed, without describing any explanation the owner gave when the new point-of-sale system was installed last spring.
- To trace the historical development of point-of-sale technology in the restaurant industry
- To compare this coffee shop's tipping rates with those of several unrelated businesses
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