Testing for Validity: Spearman's, Chi Square, Goodness of Fit, and t-Tests

This review video covers Chapter 8 of the Oxford University Press IB Applications and Interpretation SL textbook. The four validity tests are explained and example calculations of each test are provided. There are a few inadvertent errors in this video: 20:07 t-Test example I made a typo on the whiteboard. The last value for 1st Academy should be 35, not 45 Calculations are correct, just that one data point is wrong. 22:40 Spearman's rank coefficient Correct answer is: r sub s = .707. I used someone else's notes and didn't check the calculation. My bad for not checking the work. 27:05 Uniform distribution Correct answers are: chi square = .67, p = .98 Data is correct on the whiteboard. The values on the video are from a different problem, I misread the notes - again, my bad. I welcome comments or questions regarding this video or my YouTube channel. As you might guess, I am passionate about education and helping teenagers mature into competent, empowered, and caring human beings. I am currently exploring "Building Thinking Classrooms in Mathematics", which is transforming my classroom practice and spurring me to innovate. I welcome comments or questions from my fellow educators. Here's a link to the BTC website: https://www.buildingthinkingclassroom... This video may use or modify content from a number of textbooks, including: Oxford University Press IB Diploma Program https://global.oup.com/education/cont... Haese Mathematics IB Middle Years Program https://www.haesemathematics.com/inte... Activate Learning's Interactive Mathematics Program https://activatelearning.com/high-sch...