Mathematics, 10.04.2020 16:30 Shamasen1

A random sample is selected from a normal population with a mean of μ = 40 and a standard deviation of σ = 6. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 37.

a. If the sample consists of n = 36 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05.
b. If the sample consists of n = 9 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05?

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