Conditional probabilities and/or stacked bar graphs can reveal potential associations among categorical variables.
What to look forRelative frequency is particularly important when comparing groups of different sample size.
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.