Mathematics teachers continually look for ways to make the learning of mathematics more active and engaging. Hands-on activities, in particular, have been demonstrated to improve student engagement and understanding in mathematics classes. Likewise, many scholars have emphasized the growing importance of giving students experience with the Internet and related technologies at school, which give us new ways to communicate and construct knowledge--for example, using search, collaboration tools, and discussion forums. This article describes a free, Web-based data collection and analysis tool, iSENSE™, that is incorporated into a hands-on probability lesson for Algebra 2 students. Using iSENSE, students were able to collect, share, and explore their own experimental data, learning about the law of large numbers. The activity addressed Common Core Standards for Mathematical Practices and mathematics learning standards in the area of high schools and probability (CCSSI, 2010).