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A sample of n=25 individuals is randomly selected from a population with a mean of u=65, and a treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M=70.

a. If the sample standard deviation is s=10, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value of .05?

b. If the sample standard deviation is s=20, are the data sufficient to conclude that the treatment has a significant effect using a two-tailed test with a critical value or .05?

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