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Question: a neuroscientist measures the reaction times in seconds during an...

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A neuroscientist measures the reaction times (in seconds) during an experimental session in a sample of cocaine-addicted (n = 6),morphine-addicted (n = 12),and heroin-addicted rats (n = 8).Mean reaction times in each sample were 16, 11, and 12 seconds, respectively. What is the weighted mean for all three samples? Hint: The overall mean is not 13.0 seconds. (Round your answer to two decimal places.)

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