Three tennis players, a beginner, an experienced, and a professional, have been randomly selected from the membership of a large city tennis club. Using the same ball, each person hits four serves with each of five racquet models, with the five racquet models selected randomly. Each serve is clocked with a radar gun and the result recorded. Among ANOVA models, this setup is most like the randomized block design.

The situation described involves randomly assigning five racquet models to each of the three tennis players, meaning each player serves with the same racquet model four times in a row (a block). The order in which the racquet models are assigned is randomized, making it similar to a randomized block design. The ANOVA model is appropriate for analyzing the differences in serve speeds across the different racquet models and between the different players.