- Studies the association between two
**categorical**variables

- Divide each cell by the total count

- Joint: percentage of a combination of the two factors (look for the key word "
**and**") - Marginal: percentage of a
**single**factor - Conditional: percentage of a single factor
**given**that we know the value of the other factor

- What percentage of students have low physical activity and high fruit consumption? (Joint)

- What percentage of students have moderate physical activity? (Marginal)

- What percentage of students have low fruit consumption within the group of moderate physical activity? (Conditional)
- 17.4% / 37.4% = 46.5%

- Test whether the two factors have association

For tables larger than 2x2

- The average of the expected counts is 5 or more and the smallest expected count is 1 or more

For 2x2 tables

- All 4 expected cell counts are 5 or more

- Remember to do the
**WEIGHT CASES**

- Thanks for your hard work in this lab
- You are all
**GREAT**!