Question: To test the hypothesis that raters would indicate a higher level of enjoyment after viewing the Super Bowl ad, define the population parameter of interest.

To test the hypothesis that raters would indicate a higher level of enjoyment after viewing the Super Bowl ad, define the population parameter of interest. H0: d is the mean rating in January. H0: d is the mean rating in March. H0: d is the mean difference in ratings (March - January). H0: d is the mean difference in ratings (January - March)

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