Study Was Conducted to Look at Whether Caffeine Improves Productivity

Multiple Choice

study was conducted to look at whether caffeine improves productivity at work in different conditions. There were two independent variables. The first independent variable was email, which had two levels: 'email access' and 'no email access'. The second independent variable was caffeine, which also had two levels: 'caffeinated drink' and 'decaffeinated drink'. Different participants took part in each condition. Productivity was recorded at the end of the day on a scale of 0 (I may as well have stayed in bed) to 20 (wow! I got enough work done today to last all year) .
- Which of the following tests could we use to analyse these data?

A) Two-way repeated-measures ANOVA
B) Three-way ANOVA
C) t-test
D) Two-way independent ANOVA