**1.** **Explain the 4 assumptions of regression analysis and the importance of making sure that each of these assumptions are upheld.**

**2.** **Explain why hypothesis testing has been positioned as one of the greatest discoveries of the 20th century?**

**3.** **Explain the difference between a z-distribution and a t-distribution?** **When should a t-test versus a z-test be used?** **When can both be used?**

**4.** **What are some key considerations when running a regression analysis?** **What are some pitfalls every analyst should be aware of?**

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