Continuing....

Research costs overwhelmed most of the programs cost. Even the need for a parent at home for BOTH test and control groups was something that is unique to this study but insured a good record of the students and their families. 

But these costs are for BOTH test and control groups, so are important to the validity of the study. The only difference between test and control group is preschool experience. 

Keolu lies when he tries to compare the test group to a standard preschool. There is NOT scientific justification in the comparison - except that he's probably thinking like a lawyer by saying anything in his comment to justify his opinion.