I would be interested in some experimental data to play around with causality concepts. Ideally, this would be data where an accompanying paper is available as well. The data set could be relatively small, and should ideally come from a randomized experiment. It would be cool if there were some covariates. It would also be ideal if the experiment the dataset is based on would be fairly intuitive to understand for a layman in this area.
Can you think of a dataset, or sources for these types of datasets, that at least satisfy some of these criteria?