Question

which of these is an example of a correlation? people who walk their dogs always use a leash. people who drink milk have fewer cavities. a case - control study includes a control group and case group. a randomized clinical trial includes a control group and an experimental group.

Explanation:

A correlation shows a relationship between two variables. Drinking milk and having fewer cavities implies a relationship between these two factors. The first option is about a practice, and the last two are about study designs, not correlations.

Answer:

People who drink milk have fewer cavities.