Statistical Calculator Web App
A responsive tool that calculates key statistics from number inputs, including:

• Standard Deviation & Variance

• Mean & Sum

• Margin of Error (95% Confidence Interval)
  Features real-time calculations, error handling, and clean UI. Users simply enter comma-separated numbers to instantly get results. Built with HTML/CSS/JavaScript in a single file - works offline in any browser. Includes input validation and mobile-friendly design