Chi-Squared Distribution
- always positive
- typically right-skewed
- one param: $\text{df}$
- when df becomes larger, the center moves, i.e. the mean value grows as well
- mean = df
- variability increases as df increases
- shape becomes less skewed, more symmetric
- for Chi-Squared tests typically need only upper-tail values
Visualization
- http://homepage.stat.uiowa.edu/~mbognar/applets/chisq.html