The research "How does a mindfulness intervention influence scores on the 63 point Beck Anxiety Inventory?" could be modified to be a correlational study by eliminating the groups (remember! no IV in a correlational study, just measurement of two variables) and instead measuring #of minutes meditated and Beck Anxiety Inventory (BAI) score. A well designed correlational study has validity and a well designed experiment has validity. better external; better internal better overall; poor overall better internal; better external poor overall; better overall