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A random sample is selected from a normal population with a mean of = 30 and a standard deviation of = 8. After a treatment

A random sample is selected from a normal population with a mean of = 30 and a standard deviation of = 8. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 33. a. If the sample consists of n = 16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with = .05.

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