Unit 6 · Identifying Sufficient Information
FRESH-START Remover — Which Two Facts Prove the Claim?
Lesson 2 of 3
Harder sufficient-information items pack the same logic into a denser trial grid — you must see which pair of facts completes the test design.
Scientific test-design questions at the end of Selective mocks are a common stretch item; the skill is identical to earlier claim tables but with more rows and traps.
You must identify the minimum set of answers that lets you check every case where the product was used and every case where it was not — without redundant or irrelevant questions.
An absolute claim (“removes every odour”) is tested on several items. Some cells show yes/no; others are blank. You choose which blanks must be filled in to evaluate the claim fairly.
Best approach: Map each item: used vs not used, outcome yes vs no. The claim needs evidence from both treated and untreated cases. Pick the two missing cells that complete that comparison — not extra detail that changes nothing.
Question
An ad claimed: "FRESH-START removes every odour." Four items were treated. To test the claim, which two answers must we know? Item 1: used? yes, removed? (a). Item 2: used? no, removed? (b). Item 3: used? (c), removed? yes. Item 4: used? (d), removed? no.
Select an answer to see the explanation.
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