A researcher wants to know if face-to-face communication is a more effective way for instructors to answer questions than email communication. Put another way, she wants to know if students who get face-to-face feedback from an instructor perform better in the class than those who get email feedback from their instructor. She designs an experiment to test the relationship using her own classes. Alpha risk = 0.05 Procedure: 1. For her 10:00 MWF public speaking class, she schedules meetings with students to discuss their progress and answer their questions. 2. For her 2:00 PM MWF public speaking class, she uses email with students to discuss their progress and answer their questions. 3. At the end of the semester, she compares the average grade percentage (0-100%) from each class. Review the study design and answer the corresponding questions. a. Identify the variables in the study and their level of measurement: (4 points) IV: Level of measurement: DV: Level of measurement: b. Is the following hypothesis directional (one-tailed) or nondirectional (two-tailed)? Explain your response (3 points). H1: Students who receive face-to-face feedback will earn higher grades than those who receive email feedback. c. Should a t-test or correlation be used to test