It states that the raw values come from the school database with a sample size of around 3,000 children. Also the teachers were giving the responses at the end

It states that the raw values come from the school database with a sample size of around 3,000 children. Also the teachers were giving the responses at the end of the school year. The parents did have to sign a letter at some point to be apart of this but it appears that there is an issue with the outcomes. I fully believe what is happening in my Head Start really is making a difference, but it seems to be harder to see the advantages right now with this research paper.