Two researchers at different North American universities compare their results for the same study, to see if the students at their respective universities are behaving differently. They find that accuracy is slightly higher in the Canadian sample (M = 52%, SD = 3) compared to the American sample (M = 48%, SD = 3) but they're not sure if this difference is statistically significant or not. What test should they use?

1. Simple linear regression
2. Pearson's r correlation
3. Paired samples t test
4. Single sample t test
5. Z test
6. Independent samples t test
7. One-way ANOVA