This grouped bar chart visualizes average anxiety levels across five ordered sleeplessness categories, split by gender (F and M). The chart uses D3.js v7 with SVG rendering and animation, drawing bars that grow from zero via a duration-800 transition. It loads CSV data, applies `d3.rollups` for grouping and `d3.mean` aggregation, and scales colors with a `d3.scaleOrdinal` scheme. Interactive tooltips on `mouseover` and `mouseout` events display exact values, while axis labels and a legend clarify the comparison.