In Statistics, when we do Hypothesis Testing, we are supposed to have two hypotheses: A primary, or Null Hypothesis and an Alternative Hypothesis. This StatQuest explains why we need the Alternative Hypothesis, even though Hypothesis Testing tends to focus on the Null. NOTE: This StatQuest follows up on Hypothesis Testing and the Null Hypothesis: https://www.youtube.com/watch?v=0oc49DyA3hU And if you'd like to learn about p-values, check out... p-values: What they are and how to interpret them: https://www.youtube.com/watch?v=vemZtEM63GY How to Calculate p-values: https://www.youtube.com/watch?v=JQc3yx0-Q9E Lastly, if you would like to learn about Statistical Tests, see:    • Linear Regression and Linear Models   For a complete index of all the StatQuest videos, check out: https://statquest.org/video-index/ If you'd like to support StatQuest, please consider... Buying my book, The StatQuest Illustrated Guide to Machine Learning: PDF - https://statquest.gumroad.com/l/wvtmc Paperback - https://www.amazon.com/dp/B09ZCKR4H6 Kindle eBook - https://www.amazon.com/dp/B09ZG79HXC Patreon: https://www.patreon.com/statquest ...or... YouTube Membership: null ...a cool StatQuest t-shirt or sweatshirt: null ...buying one or two of my songs (or go large and get a whole album!) https://joshuastarmer.bandcamp.com/ ...or just donating to StatQuest! https://www.paypal.me/statquest Lastly, if you want to keep up with me as I research and create new StatQuests, follow me on twitter: https://twitter.com/joshuastarmer 0:00 Awesome song and introduction 1:49 The Alternative Hypothesis 3:21 Testing the Null vs Alternative for 2 groups 5:38 Testing the Null vs Alternative for 3 or more groups 8:00 Summary and next steps #StatQuest #AlternativeHypothesis