Suppose a professor wants to know how the amount of time students spend studying affects student performance on microeconomic exams. What is the independent variable in this research question? O Hours spent studying Microeconomic exam test scores O The professorös opinion of the students Not enough information was provided to answer the question None of the above QUESTION 2 Suppose a professor wants to know how the amount of time students spend studying affects student performance on microeconomic exams. What is the dependent variable in this research question? O Hours spent studying O Microeconomic exam test scores O The professorös opinion of the students Not enough information was provided to answer the question O None of the above QUESTION 3 Suppose the professor designs a randomized controlled trial to answer this research question. She divides her class into two groups of equal sizes and calls them groups A and B. What must be true about the groups in order for her experiment to be a valid RCT? Select all that apply: O She randomly assigned students to the groups O One group is required to study more than the other group The average characteristics of the students in group A should be statistically similar to the average characteristics of the students in group B. "If the average age of students in group A is 21.3, then the average age of students in group B should be about 21.3 (i.e., the actual average age may differ slightly, but will not be statistically different from 21.3). Students in group A studied more prior to experiment than students in group B. "She assigned students with the highest homework grades to group B, and students with lower homework grades to group A." QUESTION 4 What type of data did the professor collect as part of her RCT? Select all that apply. O Observational data Experimental data Cross section data Time series data O Panel data

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