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

Question

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

Quizplus · Accepted Answer

A two-way independent ANOVA would be appropriate for this study as the independent variables are gender and number of hours practiced, and there are no repeated measures. The dependent variable (level of musical ability) is measured on a continuous scale. A t-test would only allow us to compare two groups at a time, while a three-way ANOVA is unnecessary as we only have two independent variables. A two-way repeated measures ANOVA is not appropriate as there are no repeated measures in this study.

Study Was Conducted to Look at Whether Caffeine Improves Productivity