Suppose The New York Times reported that a new study found that drinking coffee can improve memory and cognitive function. The study was conducted by researchers at Harvard University and involved 100 participants over the age of 60. The participants were divided into two groups, one of which drank three cups of coffee a day and the other drank decaffeinated coffee. After six months, the group that drank regular coffee showed significant improvement in memory tests compared to the decaf group.
Can we infer that "Drinking decaf coffee can improve memory and cognitive function the same way as regular coffee"? Yes, no, or maybe?