A researcher is interested in seeing if studying in different environments has an effect on test performance. She's specifically interested in whether listening to music or not (music: yes or no) will have more or less of an effect on test performance when studying takes place at home or in a public place like the library (location: home or library). After collecting data, she analyses it using R. Her outcome variable was a score (out of 20) on a math test (test_performance). Assuming the data is normally distributed and using an a-level = .05, she analyzed her data in R. A portion of her output is below: > #two-way ANOVA > al anova (al) Analysis of Variance Table Response: test_performance of Sum Sq Mean Sq F value Pr (>F) music 1 3698.0 3698. 0 156. 1978