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a random sample of n=25 scores is selected from a normal population with a mean of 20, and a treatment is administered to each individual in the sample. After the treatment, the sample mean is found to be M = 22.2 with SS =384

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  • a random sample of n=25 scores is selected from a normal population with a mean of 20, and a treatment is administered to each individual in the sample. After the treatment, the sample mean is found to be M = 22.2 with SS =384


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