Is 786 a valid sample size?

It’s always good to be critical of survey stats, especially surrounding sample size and collection method. This survey used multiple methods of recruiting to ensure the sample reflected the population of King County. The Washington Young Adult Health Survey also used well-established and validated questions from other national surveys and the King County results are consistent with statewide findings that included 2,101 participants so we can be pretty sure this is a good representative sample of young adults in King County.