In one study half of a class were randomly assigned to watch exactly 1 hour of television per day, the other half were told to watch 5 hours per day, and then their class grades were compared. In a second study students in a class responded to a questionnaire asking about their television usage and their class grades. O The first study was an observational study, while the second was a controlled experiment. O The first study was an experiment without a control group, while the second was an observational study. O Both studies were observational studies. O Each study was part controlled experiment and part observational study. O Both studies were controlled experiments.

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