A researcher wants to examine the impact of sleep on school success. He collects the following pieces of data from 100 participants: how many hours they sleep a night, on average, and their GPA over the course of two semesters. 1. What is the independent variable in this study? 2. What is the dependent variable in this study? 3. Is this an experiment or observational study? 4. What is the null hypothesis? 5. What is one alternative hypothesis? 6. Who is the population for this study? 7. What is the most appropriate analysis (i.e., z-test, t-test, ANOVA, correlation, regression, Chi-Square - 2 points)? 8. Why is that the most appropriate analysis (2 points)