Answer the question based on the study described: The manager of a music store wants to determine whether classical music affects mood more than rock music. For her experiment, she randomly selects 15 people from the population and proceeds to establish a baseline. She waits until the 15 people are in a neutral mood, and then has them listen to an audio track with rock music and then immediately re-records their mood. Later, when the people are once again in a neutral mood, she has them listen to an audio track with classical music and once again immediately re-records their mood. The scale of measurement for the mood measure is ratio, and the scores were normally distributed. Assume all test assumptions have been met. Are the groups dependent or independent? Oa. Dependent Ob Both Oc Neither Od. Independent

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