Cognitive source | Choose the number of people | Percentage | Ranking |
Cell phone | 130 | 55% | 1 |
Network | 111 | 47% | 2 |
Newspapers and magazines | 83 | 35% | 3 |
Teacher and classmates | 82 | 35% | 4 |
Friends and relatives | 37 | 16% | 5 |
Tennis textbook | 26 | 11% | 6 |