An interactive browser-based dashboard for the t-distribution — drag sliders to shade tail areas, toggle a live N(0,1) overlay to watch convergence happen in real time, and explore the full critical values table with live highlighting. The clearest visual explanation of why we use t instead of z. How it works: Students open the HTML file in any browser and see an interactive t-distribution curve. Sliders control degrees of freedom (1–60) and the t-value. A three-way mode toggle switches between