https://allendowney.github.io/CompStats/effect_size.htmlhttps://allendowney.github.io/CompStats/hypothesis.htmlhttps://allendowney.github.io/CompStats/index.htmlhttps://allendowney.github.io/CompStats/pmf_intro.htmlhttps://allendowney.github.io/CompStats/resampling.htmlhttps://allendowney.github.io/CompStats/sampling.htmlhttps://allendowney.github.io/CompStats/text_analysis.htmlhttps://allendowney.github.io/CompStats/tumbleweed.html