Since when does it take a study to determine what God has said to be the truth? The only people who put any stock in such a study are atheists and agnostics.
I'm amused thinking how the researchers will try to control and cover all the bases in their next study design -- soundproof rooms, maybe? "background prayer", lol! How about this, Group A prays just in the morning for no more than 10 minutes, Group B prays am & pm ... : >