Walkabout the Galaxy
atmospheric chemistry; oceanic chemistry; supernova
Astrophysics and Astronomy | Physics
In another wide-ranging episode, we discuss how atmospheric and oceanic chemistry changes wiped out most life on Earth 250 million years ago, the best evidence yet for a third type of supernova, and the importance of timekeeping for astronomy and space missions. We also have historical clock trivia and a lot of space news to share.
The Reduced Chi-Square Statistic
They say there are lies, damn lies, and statistics. We say there are descriptive statistics, inferential statistics, and if you've got the courage to find out whether or not all your fancy ideas hold any water, the reduced chi-squared statistic. Taking the chi-squared distribution and reducing it by the number of degrees of freedom can set you, and your model, free. Free from doubt that you don't know what you're talking about. To sure up your hypotheses, collect some data, and check them out with reduced chi-squared statistic. Where's the beef? (Wendy's).
@ Joshua Colwell, All Rights Reserved
Length of Episode
Colwell, Joshua; Dove, Adrienne; and Cooney, James, "Things that Blow. And Clocks." (2021). Walkabout the Galaxy Podcast. 168.