Most sports injuries are immediate and obvious, like a broken leg. However, some can be more subtle, like the neurological damage that may occur when soccer players repeatedly head a soccer ball. To examine long-term effects of repeated heading, Downs and Abwender (2002) examined two different age groups of soccer players and swimmers. The dependent variable was performance on a conceptual thinking task. Following are hypothetical data, similar to the research results.
a. Use a two-factor ANOVA with ?? ?? .05 to evaluate the main effects and interaction.
b. Calculate the effects size (n2) for the main affects and interaction
c. Briefly describe the outcome of the study.