Maybe Apple shouldn’t bother making that rumored seven-inch iPad 3 to compete with the Kindle Fire, because a report by NPD In-Stat claims that larger tablet screen sizes lead to longer engagement from users than their smaller counterparts. The study found that most tablet owners have screen sizes between nine and 11 inches and “optimized for sophisticated uses that require a lot of interaction.” NPD In-Stat concluded that the top uses for tablets are productivity-based activities such as Web browsing, email and applications. Smaller-screen devices of less than five inches, like smartphones, are the preferred tools for entertainmentbased endeavors such as listening to music or watching videos.