Discussion:
Q1. What is the null hypothesis in a chi-squared test of independence?
Q2. How many "tails" can a chi-squared test have, one or two?
Q3. In a regression analysis, what do the residuals from the fitted line add up to?
Q4. List the assumptions under which the linear regression model is supposed to work.
Q5. What is the interpretation of the coefficient of determination? Between what values can it vary?