Statistics Blog

A/B Testing Example (Two Proportion Hypothesis Test)

September 25th, 2019 by boxplotanalytics

A/B testing (sometimes called split testing) is comparing two versions of a web page, email newsletter, or some other digital content to see which one performs better. A company will compare two web pages by showing the two variants (let’s call them A and B) to similar visitors at the same time. Typically, the company […]

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Population Mean Hypothesis Test Example

September 25th, 2019 by boxplotanalytics

The Situation: Kakes+, a Pennsylvania company that makes terribly unhealthy small pies/cakes, believes that their machines are overfilling their blueberry pies. Kakes+ wants to test this statistically, and has recruited you to come up with a data-backed answer. The pies should weigh 8 ounces each. Step 1: Collect Data You need to weigh the pies […]

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100th Anniversary of Variance

December 28th, 2018 by boxplotanalytics

This year (2018) is the 100th anniversary of a paper by R. A. Fisher, which introduced the statistical term “variance”. Variance is one of the toughest concepts in statistics, but it’s crucially important. Variance tells you how spread out your data are (yep, “are”; the word “data” is plural!). First, let’s get some terminology out of […]

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