Carl Sagan’s intelligence data. In his book, The Dragons of Eden, Carl Sagan presented a graph showing the brain and body masses, both on log scale, of a collection of animal species. The purpose of the graph was to describe an intelligence scale: the ratio of the average brain weight over the average body weight […]
In a normal Q-Q plot, we expect to see data points line up to form a straight line when they are random samples from a normal distribution. As in almost all statistical rules, this expectation is literally an “expectation” or what we expect to see on average. When the sample size of the data is […]
The 1971 edition of Dr. Seuss’s The Lorax included lines describing the dire fate of the “humming fish” after their pond was polluted: “They’ll walk on their fins and get woefully weary in search of some water that isn’t so smeary. I hear things are just as bad up in Lake Erie.” The last line […]
The Student’s t-test The famous t-test was initially illustrated by “Student” in a paper published in 1908 (available at: http://biomet.oxfordjournals.org/ cgi/reprint/6/1/1). In the paper, Student used several examples to illustrate the process. One example (Illustration 3) discussed the yield of barley of seeding plots with two different kinds of seed. Each type of seed (kiln-dried […]
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