This is personal study note
Copyright and original reference:
https://www.youtube.com/watch?v=qkmRA2D0W0Y&list=PLsri7w6p16vvQCo9pmuRNY_SYoOGB6bWM&index=2
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On 2 populations
- About the mean difference
- Test hypothesis
- Independent sample
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1. What is independent sample
2. Case1: enough sample, you know population standard deviation
3. Case2: enough sample, you don't know population standard deviation
4. Case3: not enough sample, you know population standard deviation
5. Case4: not enough sample, you don't know population standard deviation
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Parameter and statistic of "independent sample"
Sample a and b can be enough or not-enough
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Due to above characteristic, variance information is important
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