medium · GMAT Verbal
An online retailer found that shoppers who received a follow-up email recommending related products after a purchase spent, on average, 20 percent more over the next month than shoppers who did not receive such an email. The retailer concluded that sending follow-up recommendation emails causes shoppers to spend more, and it plans to send these emails to all customers.
Which of the following would be most useful to know in evaluating the retailer's conclusion?
- Whether shoppers who received the follow-up emails were chosen because they had already shown a pattern of frequent, high-value purchasing.
- Whether shoppers found the recommendation emails annoying.
- Whether the related products recommended in the emails were in stock at the time the emails were sent.
- Whether the recommendation emails were more expensive to produce than ordinary promotional emails.
- Whether the retailer's overall sales increased compared with the previous year.
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