Selecting the Population to be Surveyed
Before you can decide who you will survey, it is important that you know the overall size of the population you are surveying (the group you are trying to learn about). The population size may be the total number of clients served by your organization, or it may be the number of clients that participate in a particular activity or receive a particular service.
The sample size is the number of people you plan to interview using the Health Indicators survey tool. The larger your sample size, the more sure you can be that their answers accurately reflect the population you are trying to learn about.
If you choose to interview all your clients, you can be certain that the results will provide you with an accurate picture. But that may not always be possible due to time and resources, in which case you may choose to interview a subset or percentage of your target population.
If you take a sample, we recommend that your sample not be less than 30% of the population size and no less than 100 people. If the population you are trying to learn about is less than 100, we recommend surveying all of them.
Remember, this is not a research project; who you choose to interview does not need to be a random sample.
This tip sheet from Penn State University offers guidance on how to determine a sample size.
Creative Research Systems offers a
that can help you quantify the level of precision you have with a given sample size of a larger population.