1. Does correlation equal causation? Does the strength of correlation depend on the direction? What is the meaning of a zero correlation? Explain your answers.
2. What is the difference between an independent and a dependent variable? Does a regression model imply causation? Explain why or why not.
3. What terms describe the fit of a regression equation to the data? What is the importance of the coefficient of determination (r2)? How do you identify outliers in your data? How do they affect your regression equation?
4. What are the requirements that must be met for a regression analysis? What happens if these requirements are violated? Why is analysis of residuals important?
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