Amtrak launched its high-speed train, the Acela in December 1000.Not only is it the only high-speed line in the United States, but it currently is the only Amtrak line to operate at a profit.The Acela line generates about one quarter of Amtrak's entire revenue.The Acela is typically used by business professionals because of its fast travel times, high fares, business class seats, and free Wi-Fi.As a new member of the marketing department for Acela, you want to boost young ridership of the Acela.You examine a sample of last year's customers for whom you have demographic information and find that only 5% of last year's riders were 21 years old or younger, but of those, 90% used the Internet while on board as opposed to 37% of the riders older than 21 years.

-What kind of study is this?Can you conclude that Internet use is a factor in deciding to take the Acela?