#### Understanding

Conditional probabilities and/or stacked bar graphs can reveal potential associations among categorical variables.

### What to look for

Relative frequency is particularly important when comparing groups of different sample size.### Sample Assessment

The table below describes risk factors for obesity associated with age.

a) What do these number represent? Are they frequencies or relative frequencies or neither?

Answer: These numbers represent relative frequencies, but they are presented as percentages between 0 and 100 rather than as decimal numbers between 0 and 1.

b) Does there appear to be an association between age group and obesity risk?

Answer: There does appear to be ans association. The older group has a much higher percentage at risk than the younger group.