I'm curious. You state that in HS kids can really start to evaluate the data and decide how good it is. But using box plots, students can start that level of scrutiny of their data starting in 6th grade (CCSS-m places box plots in grade 6). Is there any reason why you might not engage middle school students in the evaluation of their data? Or is this based purely upon the coherence as described in the Framework for Science Education? Thanks! These videos are REALLY helpful!