As a public health marketer, it is important to know when to run a market research survey or to run an experiment.

A market research survey is often done as a first step in a marketing plan to gain baseline data from the target population. For example, if a health department was looking to find out the eating habits of middle schoolers in the county a survey would be appropriate.
A marketing experiment is generally done to fine tune messaging and to see what is most effective at persuading your target population. For example, if a health department wanted to find out which of two nutritional messages middle schoolers preferred, a marketing experiment would be appropriate.
Both marketing surveys and experiments are important in the formation of public health marketing, and can improve the effectiveness of campaigns.