medium · GMAT Verbal
A publisher observes that novels released with a prominent celebrity endorsement on the cover sell, on average, three times as many copies in their first month as comparable novels released without such an endorsement. The publisher concludes that securing a celebrity endorsement causes a substantial boost in a novel's first-month sales.
Which of the following, if true, most strengthens the publisher's conclusion?
- A trial randomly adding endorsements to half of one identical print run showed the same threefold gap.
- Celebrities who agree to endorse novels tend to already have large social media followings.
- Publishers generally reserve endorsements for novels already believed to have strong commercial potential.
- The fee publishers pay for a celebrity endorsement has risen fairly steadily in recent years.
- Readers surveyed after finishing an endorsed novel usually report high satisfaction with it.
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