To test reaction times, a computer program will display a red circle. When it changes to yellow, the users click the mouse as fast as they can. The program will then display the reaction time. Students want to compare reaction times between people using their dominant hand and nondominant hand on the mouse.
a. Suppose you had 20 subjects participating in this study. Describe how you would conduct this study with a paired design with repeated measures.

b. If you found a significant difference in reaction times, could you conclude that the hand being used caused the difference?