Suppose a new study conducted by a team of scientists has found a correlation between eating dark chocolate and improved cognitive function. The study involved over 500 participants who were split into two groups - one group consumed dark chocolate daily for six months, while the other group did not. After the study period, the group that ate dark chocolate showed significant improvements in memory and problem-solving skills.
Can we infer that "All participants in the study were over the age of 70"? Yes, no, or maybe?