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A researcher believes that length of time spent listening to classical music increases memory for previously learned material. She has 4 groups of 5 subjects listen to either 10 min., 20 min, 30 min, or 40 min. of Mozart symphonies, then tests their recall memory for a list of words they previously attempted to memorize. The mean number of words recalled by each group is given below:
10min. M = 6.5 20min. M = 7.75 30min M = 8.5 40min. M = 8.5
SS within = 31.75 SS between = 10.69
At the α = .05 level, do these data indicate that there is a difference in memory performance based on how long people listen to Mozart? If so, which listening times do better than which other ones?
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