Unit 4 · Strengthening Arguments
Stain Remover Ad — Strengthen the Claim
Lesson 11 of 11
About this lesson
An advertisement claims STAIN-GONE never fails. Four items were washed — but key answers are missing. Which two blanks do you actually need to fill in to test whether the claim is true or false?
Chapters
Question
An advertisement for stain remover claimed:
STAIN-GONE never fails to remove a stain.
Four stained items of clothing were washed, and two questions were asked in each case:
| item | was STAIN-GONE used in the wash? | was the stain removed? |
|---|---|---|
| 1 | yes | (a) |
| 2 | (b) | yes |
| 3 | no | (c) |
| 4 | (d) | no |
Which two of the missing answers must be known in order to test the truth of the claim in the advertisement?
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