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Andrew Simonson
2024-10-03 23:47:33 -04:00
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## Assumptions and Learnings
- probability density function expected value
- Confidence interval is not my value * confidence, it's confidence chance of being in my range
- I've made some mistakes in stat review, looking at narrow topics before covering broader parent topics. Should reorganize structure (tree, not list?)
t-test, z-test: both are hypothesis tests
The t-test is used when the population variance is unknown, or the sample size is small (n < 30)
The z-test is used when the population variance (σ2) is known *and* the sample size is large (n > 30)
To create a z-distribution table, mathematicians calculate the CDF for various z-scores and tabulate the results.