For questions regarding the proper selection of subjects for a scientific experiment or survey, accounting for both demographics and population size

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Where to recruit paid participants for online Inquisit experiments?

My team and I are trying to use Inquisit for a reaction-time based experiment looking at attentional bias. However, with the no download policy on Mturk and CrowdFlower, we don't know a good site to ...
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If a study has both random assignment and random sampling?

If a study has both random assignment and random sampling, does it have both high external and internal validity?