chance909 t1_j1oiyl9 wrote
Reply to comment by gudamor in A study on volleyball players found that caffeinated chewing gum significantly improved attack accuracy compared to placebo. However, this did not improve results in jumping tests, running tests, and other volleyball specific-skills, including speed tests and accuracy during the volleyball serve by glawgii
From the statistics textbook:
"With 20 tests being considered at a p-value of 0.05, we have a 64% chance of one test being significant even if all tests are actually non-significant"
If you have multiple testing, you need a correction like Bonferroni or FDR to avoid this issue.
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