A random sample of n = 25 scores is selected from a normal population with a mean of μ = 40. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 44.  If the population standard deviation is σ = 5, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a one-tailed test with α = .05. Calculate the Cohen’s d.

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