statistics

Learn to calculate z-score for measuring a number's deviation from a small set like [27,43,17,5] with x=22. Is -0.07 significant or negligible? JS code review, interpretation thresholds, small sample challenges, and z vs t-test.

Learn how to plot two normal probability density functions on a single graph in R using lines(), par(new = TRUE), or ggplot2 for a clean overlay and add legends.