An experimenter was interested in the effects of reward on performance in basketball shooting. Ten male and ten female participants who had not played basketball before were asked to participate in the study. For the first 10 shots, they earned 5 cents for each basket; for the next 10 shots, they earned $1 per basket; and for the final 10 shots, they were awarded $5 per basket. Results indicated that males' performance improved more than females' as reward level increased, but the degree of improvement depended on the reward level. Males scored more baskets than females, and all participants scored more baskets when given greater rewards.

Identify the design

Identify the independent groups variables

Identify the repeated measures variable(s)

Was there an interaction?

Was there a main effect for reward?

Was there a main effect for gender?

What is the most obvious confound in this study?