add more hints about what priors to use in malingering question? A bunch of people tried to use gaussian priors which don't make sense. Also maybe give some hints about using _.merge and friends to data wrangle the big list of participant group assignments into the output?
Make it clearer in 1b that we expect them to actually implement the posterior predictive for the new alien
_.mergeand friends to data wrangle the big list of participant group assignments into the output?