easy · GRE Verbal
A firm added live chat, and online purchases increased. It concludes that live chat caused the increase.
The answer to which question would be most useful for evaluating the conclusion?
- How much did the live-chat software cost each month?
- Was a major price promotion launched when live chat began?
- Which manager approved adding chat to the website?
- Was the chat launch announced on the firm’s home page?
- How long had the firm sold products through its website?
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