Suppose the instructor of a class was interested in examining whether time of day influenced test taking. For group A, quizzes always occurred at 1 PM. For group B, quizzes always occurred at 9 PM. To choose the groups, the instructor flipped a coin for each student- if "heads", then the student would be part of group A and if "tails", the student would be part of group B. At the end of the semester, the instructor found that students in group A received a median grade of C+ whereas students in group B received a median grade of B+. a. What kind of data structure is this: descriptive, correlational, group comparison - experimental, or group comparison-non-experimental? b. What is the most likely scale of measurement for each variable? c. Can the researcher infer causality?

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