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.

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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...