1.31 Light and exam performance: A study is designed to test the e↵ect of light level on exam performance of students. The researcher believes that light levels might have different effects on males and females, so wants to make sure both are equally represented in each treatment. The treatments are fluorescent overhead lighting, yellow overhead lighting, no overhead lighting (only desk lamps).

a) What is the response variable?
b) What is the explanatory variable?
c) What is the blocking variable?