Serena Williams was able to demonstrate in her research study that practice influences the number of matches won in tennis. However, she wanted to expand onthe current research andmake her study a bit more interesting by adding amediating variable. Which of the following can also serve as a mediating variable in her study?

Tip: It might be helpful to draw a diagram / illustration with boxes for this question.

• The number of corporate sponsors
• Strengthening the technique of tennis shots
• The effectiveness of the coach
• Support from the fans