AND or OR, that’s the question [Power / Sample Size]

posted by chrisk – 2022-08-10 19:46 (615 d 09:01 ago) – Posting: # 23213
Views: 4,849

Thank you Helmut. My latest question was due to my imprudence. My alternative of interst is the one with "AND", indeed.

But this exercise was still helpful since I naively expected the "OR" alternative to result in a smaller sample size compared with the "AND" alternative. I failed to realise that a type I error comes into play for the "OR" alternative, which explains a larger sample size (n=42 vs n=36).

Thank you also for modifying the R program. I sincerely appreciate your time and efforts.

And lastly, thank you for correcting me on the difference between wisdom and knowledge :-) Thank you for sharing your knowledge!

Have a wonderful day!

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