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 effects and the interaction.
c. briefly describe the outcome of the study
factor b: age
college older
soccer n= 20 n=20
factor a: m=9 m= 4
sport t= 180 t = 80
ss= 380 ss= 390

swimming n= 20 n = 20
m = 9 m = 8
t = 180 t =160
ss = 350 ss= 400

ex2 = 6360